Exhibit 4 — Santa Ana City Council, June 2, 2026

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| i

SANTA ANA

LOCAL SIGNAL

SYNCHRONIZATION PLAN
2026
June 2, 2026
EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 1

INTRODUCTION

On November 6, 1990, the voters in Orange County approved a ½ percent sales tax for twenty years to fund transportation improvements known as Measure M. This sales tax provides funding for street and road improvements to local agencies through formula distribution and competitive processes. On November 6, 2006, voters approved Measure M2 to continue the ½ percent sales tax for thirty years, beginning in 2011.

Project P, the Regional Traffic Signal Synchronization Program (RTSSP), was included as part of Measure M2.

The RTSSP is comprised of a 750-mile regional signal synchronization network with approximately 2,000 signals. The goals of the program are to improve the flow of traffic on Orange County streets and roads by implementing multi-agency signal synchronization. Local agencies and Caltrans are encouraged to work cooperatively with the Orange County Transportation Authority (OCTA) to synchronize traffic signals throughout Orange County on a corridor basis to improve travel time and reduce stops. Local agencies will maintain local control and responsibility for signals within their jurisdiction. Any changes to traffic signals, signal timing equipment, or related signal policies (including transit signal priority, transit preemption, or emergency vehicle preemption) are at the full discretion of the responsible local agency.

To establish eligibility for Measure M2 funds in general and Traffic Signal Synchronization Program (TSSP) in specific, including both fair-share and competitive programs, local agencies must meet the following requirements:

1. Local Signal Synchronization Plan Adoption
Adopt and maintain a Local Signal Synchronization Plan by June 30, 2026. The plan must be consistent with OCTA Regional Traffic Signal Synchronization Plan.

2. Local Signal Synchronization Plan Update
To remain eligible, the local agencies must maintain and update the plan every three years for the duration of Measure M2.

In addition to the requirement for Measure M2 funds, the City of Santa Ana’s Local Signal Synchronization Plan also establishes the needs for well- maintained and synchronized traffic signals to reduce congestion and provide safe and efficient traffic movements in the City.

The City initially adopted the Local Signal Synchronization Plan on December 6, 2010 and subsequently updated on June 19, 2014, June 28, 2017, June 16, 2020, and June 23, 2023. This is the update for June 2026.

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I. Local Signal Synchronization Goals

The primary goal is to maintain a safe and efficient
transportation network with emphasis on traffic
signal synchronization along major corridors. This
Local Signal Synchronization Plan will serve as a
guide for the implementation and maintenance of
optimized signal timing along these corridors. The
objective is to reduce delay, number of stops, fuel
consumption, and air pollution emissions along with
optimizing traffic progression through the system. A
key focus of the City is improving safety for all
roadway users. A well-timed, synchronized system
will reduce collisions as a result of improved traffic
flow and will minimize diversion of traffic to local and residential neighborhoods, improving safety and
traffic conditions in those areas. The City is also
focused on improving emergency vehicle response
times through traffic signal pre-emption, allowing for
much safer travel through the signal system. Another
priority is supporting multimodal transportation,
including active transportation and transit signal
priority, while finding a balance between the needs
of all roadway users to promote a more equitable
transportation system.

The City has been synchronizing its traffic signals
since the 1970’s with the implementation of the
Multisonics Vehicle Management System. Since
then, the City has continued to upgrade and improve
its traffic signal infrastructure and operations. The
City’s major effort in improving its traffic signal
operations and infrastructure began in early 1990’s
when the City received funding from State of
California Transportation System Management
grants to implement an Advanced Traffic
Management System (ATMS) that included traffic
communication infrastructure, new traffic signal
systems, and incorporated many elements of
Intelligent Transportation Systems (ITS) such as
CCTV, Video Detection Systems (VDS), and
Changeable Message Signs (CMS). The City is
actively upgrading all communications infrastructure
to Fiber Optic Cable to facilitate faster
communication and synchronization between
intersections and the central ATMS system.

Recognizing the need to maintain uninterrupted
traffic flow through adjacent agencies, the City
started to work with Caltrans in the early 1990s for
the City to maintain and operate the majority of
Caltrans’ ramp traffic signals in Santa Ana to allow
synchronization with local traffic signals. Similarly,
in 1992, the City of Fountain Valley agreed to share
the operation of its traffic signals on Harbor Blvd
with Santa Ana so Harbor Blvd could be
synchronized throughout both cities.

Additionally, Santa Ana has maintenance
agreements with the neighboring cities of Costa
Mesa, Garden Grove, Orange, Tustin and Fountain
Valley to maintain and operate signals that reside in
both City limits. Since then, the City has been
active in replacing outdated equipment and
upgrading traffic signal infrastructure to help
achieve its goals of maintaining and further
progressing a safe and efficient network of streets.

As part of the effort to maintain traffic flow and
reduce congestion, the City analyzed and optimized
all of its arterial streets including synchronization on all major arterials in the City in 2004 and again in
2010. Since then, the City has participated in
numerous OCTA Regional Traffic Signal
Synchronization Program (RTSSP) corridors. The
City fully supports and commits to working with
OCTA and other local agencies to maintain
regional traffic synchronization on all arterials in the OCTA Regional Traffic Signal Synchronization
Program.

Since the previous LSSP update in 2023, the City of
Santa Ana has participated in RTSSP projects along
the following corridors:

 Edinger Avenue
 Warner Avenue
 MacArthur Boulevard
 First Street-Bolsa Avenue
 Tustin Avenue-Rose Drive
 Segerstrom Avenue-Dyer Road

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The City’s plan moving forward includes the following near-term and long-term goals:

1. Near-term:

(a) Maintain synchronization on all arterials in
the City

(b) Complete synchronization timing for the
following corridors:
 Kraemer Boulevard/Glassell
Street/Grand Avenue
 1 st Street
 Euclid Street
 McFadden Avenue
 Bristol Avenue
 17 th Street-Westminster
Avenue

(d) Upgrade central business district
(downtown) traffic signal controllers

(e ) Relocate Traffic Management Center to
Ross Annex Building

2. Long Term:

(a) Continue to maintain synchronization on all
arterials in the City

(b) Complete the Citywide fiber communication
network

(d) Retime arterials every 3 to 4 years or
Citywide every 6 to 10 years

(e) Complete implementation of Video
detection citywide

(f) Replace outdated traffic signal cabinets

(g) Upgrade signals to current standards for
pedestrians and bicycles
(h) Implement the latest proven technology to
monitor and improve traffic signal
operations where feasible

(i) Employ Advance Traffic Signal
Performance (ATSPM) Measures

(j) Prepare for Connected Vehicle technology

(k) Implement Transit Signal Priority (TSP)
along bus routes

(l) Install Emergency Vehicle Preemption
(EVP) along priority corridors to improve
response times

(m) Install Battery Back-up Systems (BBS) to
improve traffic signal reliability

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II. Traffic Signal Synchronization Street Routes

The arterials and streets in the City Master Plan of Streets and Highways are part of the City LSSP. Many of these arterials are also part of OCTA’s Regional Traffic Signal Synchronization Plan. Table 1 (Synchronized Streets) and Figure 1 (Traffic Signal Synchronization Routes) on the following pages represent all streets and traffic signals that are currently synchronized and monitored on a regular basis.

Table 1 - Synchronized Streets

Arterial Classification Synchronized OCTA
RTSSP
1 Westminster Ave/17th St Major Yes Yes
2 1st St Major Yes Yes
3 Edinger Ave Major Yes Yes
4 Warner Ave Major Yes Yes
5 Segerstrom Ave/Dyer Rd Principal/Major/Primary Yes Yes 6 MacArthur Blvd Major Yes Yes
7 Euclid St Major Yes Yes
8 Harbor Blvd Major Yes Yes
9 Fairview St Major Yes Yes
10 Bristol St Major Yes Yes
11 Main St Major/Primary/Secondary Yes Yes
12 Grand Ave Major Yes Yes
13 Tustin Ave Major Yes Yes
14 McFadden Ave Secondary Partial Yes
15 Newhope St Secondary Yes No
16 Civic Center Dr Secondary Partial No
17 Santa Ana Blvd Major/Primary Partial No
18 4th St Major/Primary Partial No
19 Flower St Primary/Secondary Partial No
20 Central Business District Misc. Yes No
21 Broadway Secondary Partial No
22 Standard Ave Secondary Partial No
23 Raitt St Secondary Partial No
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Figure 1- Traffic Signal Synchronization Routes

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III. Traffic Signal Infrastructures and
Synchronization Inventory

A. Traffic Management Center (TMC)

The TMC provides City staff with a centralized
command and control of all city traffic signals. It
supports all current and future ITS field devices and
technologies. It is a central housing for all traffic signal systems, communication hardware, and traffic signal
video/monitoring systems.

The City has a Main TMC located at the City Hall
Building, 20 Civic Center Plaza, Santa Ana, CA 92701,
shown in Image 1. There is also a Remote TMC
located with the same address in the adjacent Ross
Annex Building, shown in Image 2.

As part of the upcoming Bristol RTSSP, the City plans to relocate the existing Main TMC facility and systems into the Ross Annex Building. This will allow the city to
decommission the existing Remote TMC (RTMC) and
centralize its traffic operations and related systems within a new Main TMC. The new Main TMC is to be relocated
to the same floor space and operations area as all traffic engineering personnel.

As part of the TMC relocation, the City anticipates
relocating the existing servers to new server racks,
relocating existing workstations and procuring new
workstations, implementing a new video wall, and
reterminating the City’s fiber optic cable at the new
TMC. Additionally, the City will refresh their existing Centracs licensing for an additional three years. The
City of Santa Ana uses Econolite Centracs Central
Advanced Transportation Management System
(ATMS). Centracs is used to facilitate the operation of the existing traffic control system via the existing
communication infrastructure.

The existing TMC systems communicate to the entire
traffic network through seventeen (17) separate fiber
optic legs. Each cable is terminated on 1 of 3 FDUs
(Fiber Distribution Units) housed in the TMC server
racks. These (17) communication legs are all landed on
a Layer 3 Ethernet Switch which acts as the central
gateway on the network. An image of the TMC
equipment room is shown in Image 3.

Image 1 – City of Santa Ana Traffic Management
Center
Image 2 – City of Santa Ana Remote Traffic
Management Center
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B. Traffic Signal System, Controllers and Cabinets

The City of Santa Ana
currently operates Econolite’s
Centracs Advanced
Transportation Management
System (ATMS) software,
which communicates with
traffic signal controllers
through the City’s Ethernet
communications network.

Centracs ATMS provides a
citywide, map-based interface
that allows staff to quickly view
intersection status and identify
locations that are offline,
online, or requiring attention.

The system supports remote
monitoring and
troubleshooting by providing
access to controller status
information, alarms, and event
logs. Centracs ATMS also
supports remote updates to controller databases, which helps staff implement timing plan changes and coordination updates efficiently. In addition, Centracs can generate automated notifications, including email alters for traffic signal pre-emption faults. Together, these capabilities provide the City with a centralized platform to monitor system health, respond to issues quickly, and support efficient ongoing management of traffic signal operations. Figure 2 provides an example of the Centracs citywide status map interface.

Figure 2 – Centracs Citywide Signal Status
Overview Map

Figure 3 – Centracs Intersection Signal Graphics

Image 3 – City of Santa Ana TMC Equipment Room
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In 2011, the City completed an eight-phase project to
upgrade all outdated NEMA controllers to 2070
controllers running then-current firmware. This project allowed the City to fully integrate and utilize Centracs in effectively managing all 329 traffic signals. Since
that deployment, many of the existing controllers have
reached end-of-life status and are no longer being
supported by the manufacturer. Furthermore, these
existing controllers lack key capabilities available in modern platforms, including advanced fault detection,
enhanced monitoring of conflicting indications,
improved cabinet and signal health diagnostics, and
modern fail-safe operation, fault isolation, and
controller recovery capabilities that reduce the risk of unsafe signal behavior during equipment or power
failures. Accordingly, the City plans to upgrade all
controllers to Advanced Traffic Controllers to better
support advanced traffic signal performance
measures, transit signal priority, connected vehicle
technology, and modern safety standards.

Most of Santa Ana’s signal cabinets are Type 332
which are built to conform to the widely used Caltrans
TEES standards. The 332 cabinets utilize rack mount
equipment for the output file, input files, PDA, and
other components that are in the cabinet. The city
also has numerous legacy cabinets that are National
Electric Manufacturers Association (NEMA), Type
P(TS1) and Type M (Pole Mount). The City currently
plans on upgrading all outdated cabinets to their
preferred Type 332 or an Advanced Traffic Controller
Cabinet (ATCC). Both cabinets have the same
footprint, while the ATCC can operate with reduced
equipment and a cleaner layout for add-ons (including
communication, fiber, radio, BBS, EVP, and TSP
equipment), resulting in simpler maintenance, easier
troubleshooting, and greater flexibility to expand for
the City’s future operational and communications
needs.

C. Traffic Signal Video Monitoring System

The City has installed CCTV cameras at one-
hundred thirty-five (135) locations. These cameras
are installed to assist the city with a variety of
functions, including observing traffic conditions, road construction activities, incident
management, and identifying roadway issues. This
capability enables faster response times, reduced
traffic impacts, and improves overall system
performance. The City’s CCTV cameras are
managed and monitored through Milestone Video
Management Software (VMS). All cameras are
available to City staff at workstations running
Milestone VMS Client software and can also be
displayed on the video wall through the display PCs.

City staff actively uses the CCTV cameras
to monitor traffic conditions along the busiest and
most traveled corridors and intersections.

Building on the City’s CCTV capabilities, video feeds
from the Video Detection Systems (VDS) further
enhance day-to-day signal operations and data-
driven decision-making. VDS feeds, which are
available from both the TMC and
Remote TMC, provide real-time visual verification in
addition to detection functionality. VDS supports stop- bar and advance vehicle detection, bicycle detection
and differentiation, and the collection of turning
movement counts. These capabilities enable the staff
to quickly diagnose vehicle and bicycle detection
issues, evaluate detection performance, and more
informed signal timing and coordination adjustments.

VDS data and videos reduce the need for field visits,
improve response times, and support more efficient
corridor operations. Together, these capabilities
improve staff productivity, enable more proactive
system management, and allow
the City to operate and maintain a growing signal
system more efficiently using existing resources.

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D. Traffic Signal Communication

The city currently uses a combination of twisted wire pair (TWP), Fiber Optics (FO), and wireless radios for field device communications. Most of the traffic signals communication is via the City underground hardwired interconnect network, and similarly, communication to CCTV cameras is via the City underground fiber-optic network. Where fiber-optic is not available, wireless or hardwire interconnect is used for CCTV cameras. The City plans to upgrade all communication to Fiber-optic as funding becomes available.

The City traffic signal network is comprised of ‘network zones’ configured in one or more daisy chain rings. These daisy chains create an interconnected network of all traffic signal and ITS devices , originating from the TMC, which provides network redundancy and IP network segmentation. Each zone is supported by a Layer 3 Ethernet switch providing the network routing for devices on that ring. In addition, each traffic signal is supported with Layer 2 fiber optic switches enabling a link to the TMC. This traffic signal network provides a high-speed, high-bandwidth, and secure connection from the TMC to the ITS elements. Furthermore, Santa Ana employs a Network Performance Monitor (NPM) software for network management and monitoring which allows City staff to quickly and remotely troubleshoot network and communication issues.

E. Traffic Signal Synchronization

The traffic signals on the designated arterials in the LSSP are inventoried and listed in Table 2 (Traffic Synchronization Inventory). The table identifies all intersections for each arterial, associated controller type and firmware, detailed synchronization data such as cycle length of each synchronized period and Intelligent Transportation Systems (ITS) equipment. Synchronization periods include AM, Mid-day, PM and Weekend.

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Table 2 - Traffic Synchronization Inventory

Cycle Length Equipment
Corridor Cross Street Intersection AM MID PM WKND
Maintenance
Responsibility Cabinet Type Software Detection
Bike
Detection CCTV
Power
Backup Comm Other ITS ATMS Status
Westminster/17th
Newhope St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops Yes Cohu Fiber Bluetooth Centracs Online Harbor Blvd 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber Bluetooth Centracs Online Clinton St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber EVP Centracs Online Fairview St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loop s Yes Bosch UPS Wireless Bluetooth, EVP Centracs Online King St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops Yes Cohu Fiber Centracs Online English St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber EVP Centracs Online Alona St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops Yes Fiber EVP Centracs Online College Ave 140 130 140 130 Santa Ana 332 2070 AS C/3 Loops No Cohu Fiber EVP Centracs Online Bristol Market Pl 140 130 140 130 Santa Ana P (TS1) 2070 ASC/3 Loops No Fiber EVP Centracs Online Bristol St 140 130 140 130 Santa Ana 332 2070 ASC/ 3 Video Yes Cohu Fiber Bluetooth Centracs Online Fire Station Free Free Free Free Santa Ana M ASC/3 ASC/3 Loops No Fiber Centracs Online Flower St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops Yes Cohu Fiber EVP Centracs Online Ross St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops Yes Fiber EVP Centracs Online Broadway 140 130 140 130 Santa Ana 332 Cobalt EOS Loops Yes Cohu Fiber EVP Centracs Online Main St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Spurgeon St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber EVP Centracs Online Penn Wy 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber EVP Centracs Online Santiago St/I-5 NB off 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber EVP Centracs Online Lincoln Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber EVP Centracs Online Grand Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber Bluetooth, EVP Centracs Online Linwood Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber EVP Centracs Online Mabury St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Cabrillo Pk/Sherry Ln 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops Yes Cohu Fiber EVP Centracs Online Centre on 17th 140 130 140 130 Santa Ana P (TS1) 2070 ASC/3 Loops No Fiber EVP Centracs Online Tustin Ave 140 130 140 130 Santa Ana P (TS2 Type 1) 2070 ASC/3 Loops No Cohu Fiber EVP, Bluetooth Centracs Online 1st Street
Euclid St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber Bluetooth Centracs Online Newhope St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops Yes Axis Fiber Bluetooth Centracs Online Harbor Blvd 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Jackson St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Fairview St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Sullivan St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Center St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Townsend St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Raitt St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Pacific St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Copper EVP Centracs Online Bristol St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber Bluetooth, EVP Centracs Online Flower St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops Yes Cohu Fiber EVP Centracs Online Ross St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Broadway 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Sycamore St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Main St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Bush St/Cypress St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops Yes Copper EVP Centracs Online Downtown Plaza 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Copper EVP Centracs Online Standard Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Copper EVP Centracs Online Grand Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber Bluetooth, EVP Centracs Online Lyon St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online EXHIBIT 4

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Cycle Length Equipment
Corridor Cross Street Intersection AM MID PM WKND
Maintenance
Responsibility Cabinet Type Software Detection
Bike
Detection CCTV
Power
Backup Comm Other ITS ATMS Status
Elk Ln/I-5 NB off 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online I-5 SB on 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Cabrillo Park Dr 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Golden Circle 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Edinger Ave
Newhope St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops No Axis Fiber EVP Centracs Online Harbor Blvd 140 130 140 130 Fountain Valley P (TS1) Coba lt EOS Loops No Cohu Fiber Bluetooth Centracs Online Mohawk Dr 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber Bluetooth, EVP Centracs Online Fairview St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Bluetooth, EVP Centracs Online Sullivan St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber EVP Centracs Online Greenville St 140 130 140 130 Sant a Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Center St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Video Yes Fiber EVP Centracs Online Raitt St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Pacific Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Bristol St 140 130 140 130 Santa Ana P (TS1) Cobalt EO S Loops Yes Cohu Fiber Bluetooth, EVP Centracs Online Baker St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Video No Fiber EVP Centracs Online Towner St (PHB) (Future) 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber Centracs Online Flower St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Wireless EVP Centracs Online Broadway 140 140 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Main St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Orange St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops No Fiber EVP Centracs Online Maple Bike Trail 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Standard Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Grand Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber EVP Centracs Online Lyon St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Video Yes Fiber EVP Centracs Online Ritchey St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Warner Ave
Harbor Blvd 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Bluetooth, EVP Centracs Online Yale St 140 130 140 65 Santa Ana P (TS1) Cobalt EOS Loops No Fiber EVP Centracs Online Susan St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Fairview St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Bluetooth, EVP Centracs Online Greenville St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Raitt St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Centracs Online Bike Trail 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Pacific Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Bristol St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Bluetooth, EVP Centracs Online Flower St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Main St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Bluetooth, EVP Centracs Online Maple Bike Trail 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber Centracs Online Halladay St 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Standard Ave 140 130 140 65 Santa Ana P (TS1) Cobalt EOS Loops No Copper EVP Centracs Online Fire Station #2 Free Free Free Free Santa Ana 332 Cobalt EOS Loops No Wireless Centracs Online Grand Ave 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Video Yes Cohu Fiber Bluetooth Centracs Online Wright St Free Free Free Free Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Pullman St Free Free Free Free Santa Ana 332 Cobalt EOS Loops No Copper Bluetooth Centracs Online Warner Common/ The Row Free Free Free Free Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Segerstrom Ave
Harbor Blvd 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Susan St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops No Fiber Centracs Online Fairview St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Cohu Fiber Centracs Online Greenville St 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Wireless Centracs Online EXHIBIT 4

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Cycle Length Equipment
Corridor Cross Street Intersection AM MID PM WKND
Maintenance
Responsibility Cabinet Type Software Detection
Bike
Detection CCTV
Power
Backup Comm Other ITS ATMS Status
Raitt St 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Wireless Centracs Online Bear St 140 140 140 140 Santa Ana 332 Cobalt EOS Loops No Wireless EVP Centracs Online Spruce St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Bristol St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber Bluetooth Centracs Online Rosewood Ave 140 130 140 130 Santa Ana 332 Coba lt EOS Video Yes Fiber EVP Centracs Online Lowell St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Video Yes Copper EVP Centracs Online Flower St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber Centracs Online Dyer Road
Garnsey St 140 140 140 140 Santa Ana 332 Cobalt EOS Loops No Wireless EVP Centracs Online Alton Bike Trail 70 65 70 65 Santa Ana P (TS1) Cobalt EOS Other No Copper Centracs Online Main St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Centracs Online Halladay St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Tech Center Dr 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Hotel Terrace/SR-55 SB ramp 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Cohu Other EVP Centracs Online Grand Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Cohu Fiber EVP Centracs Online SR-55 NB off ramp 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Pullman St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Cohu Fiber Centracs Online MacArthur Blvd
Hyland St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Video Yes Wireless EVP Centracs Online Harbor Blvd 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Home Depot 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Susan St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Fairview St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber EVP Centracs Online Greenville St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Raitt St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops No Cohu Fiber EVP Centracs Online Bear St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Plaza Dr 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Bristol St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber Bluetooth, EVP Centracs Online Towner St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops No Copper Centracs Online Flower St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Centracs Online Birch St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Copper EVP Centracs Online Main St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber Bluetooth, EVP Centracs Online MacArthur Pl 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis BBS Fiber EVP Centracs Online Euclid St
Oakfield St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Hazard Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Loops Yes Cohu Fiber EVP Centracs Online 5th St 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online McFadden Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber EVP Centracs Online Harbor Blvd
Hazard Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online 5th St 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber EVP Centracs Online McFadden Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber Centracs Online Kent Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Axis Fiber EVP Centracs Online Lilac Ave 140 130 140 130 Fountain Valley Other Cobalt EOS Video Yes Copper Centracs Online Heil St 140 130 140 130 Fountain Valley P (TS1) 2070 ASC/3 Loops No Copper Centracs Online Garry Ave 140 130 140 130 Santa Ana P (TS1) 2070 ASC/3 Loops No Fiber EVP Centracs Online Fairview St
Trask Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops Yes Axis Wireless EVP Centracs Online Edna Dr 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber EVP Centracs Online Civic Center Dr 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops No Cohu Wireless EVP Centracs Online OCSC Ped Xing/ RR Xing 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes BBS Fiber Centracs Online 5th St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber Centracs Online Willits St 140 130 140 130 Santa Ana 332 2070 ASC/3 Video Yes Wireless Centracs Online EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 13
Cycle Length Equipment
Corridor Cross Street Intersection AM MID PM WKND
Maintenance
Responsibility Cabinet Type Software Detection
Bike
Detection CCTV
Power
Backup Comm Other ITS ATMS Status
Highland St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online McFadden Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Centennial Rd/St. Andrew 140 130 140 130 Santa Ana P (TS1) 2070 ASC/3 Video No Fiber EVP Centracs Online Harvard St 140 130 140 130 Santa Ana P (TS1) 2070 ASC/3 Loops No Axis Fiber EVP Centracs Online Alton Ave 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Bristol St
Riverglen Ln 140 Free 140 Free Santa Ana P (TS1) 2070 ASC/3 Loops No Fiber Centracs Online Memory Ln 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber Centracs Online Santa Clara Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Bristol Mkt Pl/19th 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Washington Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Video Yes Fiber EVP Centracs Online Civic Center Dr 140 130 140 130 Santa Ana 332 Coba lt EOS Video Yes Cohu Fiber EVP Centracs Online Santa Ana Blvd 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Bishop St 140 130 140 130 Santa Ana 332 2070 ASC/3 Video Yes Fiber EVP Centracs Online McFadden Ave 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber Bluetooth, EVP Centracs Online Wilshire Ave 140 130 140 130 Santa Ana P (TS1) 2070 ASC/3 Video Yes Fiber EVP Centracs Online St Andrew Pl 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Centracs Online Glenwood Pl 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Central Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops Yes Fiber Centracs Online Hemlock Wy 140 130 140 130 Santa Ana P (TS1) 2070 ASC/3 Video Yes Fiber EVP Centracs Online Alton Ave 140 130 140 130 Santa Ana 332 2070 ASC/3 Video Yes Cohu Fiber Centracs Online Target/Bristol Plaza 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Callens Common 140 130 140 130 Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Main St
MainPlace/Town & Country 120 120 120 120 Santa Ana P (TS1) Co balt EOS Loops No Axis Wireless EVP Centracs Online MainPlace/City Place 120 120 120 120 Santa Ana P (TS1) Cobalt EOS Loops No Copper EVP Centracs Online Memory Ln 120 120 120 120 Santa Ana 332 Cobalt EOS Loops No Axis Copper EVP Centracs Online Walkie Wy 120 120 120 120 Santa Ana P (TS1) Cobalt EOS Video Yes Copper EVP Centracs Online Bowers Museum 120 Free 120 Free Santa Ana 332 Co balt EOS Loops No Cohu Fiber EVP Centracs Online 20th St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops No Copper EVP Centracs Online 15th St 140 130 140 130 Santa Ana 332 Cobalt EOS Video Yes Fiber Centracs Online Washington Ave 90 90 90 90 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online 10th St 90 90 90 90 Santa Ana 332 Cobalt EOS Loops No Fiber Bluetooth, EVP Centracs Online 8th St 90 90 90 90 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Civic Center Dr 90 90 90 90 Santa Ana 332 2070 ASC/3 Video Yes Axis Fiber EVP Centracs Online 5th St 90 90 90 90 Santa Ana 332 Cobalt EOS Video Yes Axis Fiber Bluetooth, EVP Centracs Online Santa Ana Blvd 90 90 90 90 Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online 4th St 90 90 90 90 Santa Ana 332 Cobalt ASC/3 Video Yes Copper EVP Centracs Online 3rd St 90 90 90 90 Santa Ana 332 Cobalt ASC/3 Loops No Fiber EVP Centracs Online Walnut St (PHB) 70 65 70 65 Santa Ana 332 Cobalt EOS Video Yes Fiber Centracs Online Chestnut Ave 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Bishop St 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Cubbon St 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online McFadden Ave 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Russell Ave 70 65 70 65 Santa Ana P (TS1) Cobalt EOS Loops No Fiber EVP Centracs Online Borchard Ave 70 65 70 65 Santa Ana P (TS1) Cobalt EOS Loops No Fiber EVP Centracs Online Pomona St 140 130 140 130 Santa Ana P (TS1) Cobalt EOS Loops No Fiber EVP Centracs Online St. Andrew Pl 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online St. Gertrude Pl 70 65 70 65 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Goetz Ave 140 Free 140 Free Santa Ana P (TS1) Cobalt EOS Video No Fiber EVP Centracs Online EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 14
Cycle Length Equipment
Corridor Cross Street Intersection AM MID PM WKND
Maintenance
Responsibility Cabinet Type Software Detection
Bike
Detection CCTV
Power
Backup Comm Other ITS ATMS Status
Alton Ave 140 130 140 Free Santa Ana P (TS1) Cobalt EOS Loops No Fiber EVP Centracs Online Columbine Ave 140 130 140 Free Santa Ana P (TS1) Cobalt EOS Loops No Fiber Centracs Online Murphy Ave/Sandpointe Ave 140 Free Free Fr ee Santa Ana P (TS1) Cobalt EOS Loops No Copper Centracs Online Sunflower Ave 140 Free Free Free Santa Ana 332 Cobalt EOS Loops Yes Copper Centracs Online Grand Ave
Fairhaven Ave 140 130 140 Free Santa Ana P (TS1) 2070 ASC/3 Loops Yes Copper Bluetooth Centracs Online Santa Clara Ave 140 130 140 Free Santa Ana 332 Cobalt EOS Loops Yes Cohu Fiber Centracs Online 21st St 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops Yes Fiber Centracs Online I-5 NB off 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Santa Ana Blvd/I-5 SB on 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops No Cohu Copper Centracs Online Fruit St 140 130 140 Free Santa Ana P (TS1) 2070 ASC/3 Loops No Copper Centracs Online 6th St 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops No Wireless Centracs Online 4th St 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops Yes Cohu Fiber EVP Centracs Online Chestnut Ave 140 130 140 Free Santa Ana 332 Coba lt EOS Loops No Cohu Fiber Centracs Online McFadden Ave 140 130 140 Free Santa Ana P (TS1) Cobalt EOS Video Yes Cohu Fiber EVP Centracs Online Century High 140 Free 140 Free Santa Ana 332 2070 ASC/3 Loops No Copper Centracs Online St. Andrew Pl 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops No Copper Centracs Online St. Gertrude Pl 70 65 70 Free Santa Ana 332 2070 ASC/3 Loops No Copper Centracs Online Hotel Terrace/Brookhollow 70 65 70 65 Santa Ana 332 2070 ASC/3 Loops No Cohu Fiber Centracs Online SR-55 SB off ramp 70 65 70 65 Santa Ana 332 2070 ASC/3 Loops No Cohu Other EVP Centracs Online Tustin Ave
Santa Clara Ave 140 100 140 130 Santa Ana P (TS1) Cobalt EOS Video Yes Axis Fiber Centracs Online Centre on 17th/Tustin Center 140 Free 140 Free Santa Ana 332 Cobalt EOS Loops Yes Fiber EVP Centracs Online Wellington Ave 140 Free 140 Free Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Fruit St 70 Free 70 Free Santa Ana 332 Coba lt EOS Loops No Fiber Centracs Online 4th St 130 100 130 Free Santa Ana 332 Cobalt EOS Loops No Cohu Fiber EVP Centracs Online Civic Center Dr
English St 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Fiber EVP Centracs Online Raitt St 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Pacific Ave 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Fiber EVP Centracs Online Baker St 140 Free 100 Free Santa Ana 332 2070 ASC/3 Loops No Copper EVP Centracs Online Boyd Way 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Copper Centracs Online Flower St 100 100 100 Free Santa Ana P (TS1) 2070 ASC/3 Loops No Cohu Copper Centracs Online Ross St 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops Yes Copper Centracs Online Parton St 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online OC Garage/ Ped Xing 100 100 100 Free Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Broadway 100 100 100 Free Santa Ana 332 Cobalt EOS Loops No Cohu Fiber Centracs Online Sycamore St 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Copper Centracs Online Bush St 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Santa Ana Blvd
Pacific Ave 100 100 100 Free Santa Ana P (TS2 Type 1) Cobalt EOS Video Yes Copper Centracs Online Shelton St 100 100 100 Free Santa Ana P (TS2 Type 1) Cobalt EOS Video Yes Copper Centracs Online Flower St 100 100 100 Free Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online Parton St 100 100 100 Free Santa Ana 332 Cobalt EOS Video Yes Cohu Copper Centracs Online Ross St 100 100 100 Free Santa Ana 332 Cobalt EOS Video Yes Copper Centracs Online Ped Xing 90 90 90 Free Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Broadway 90 90 90 Free Santa Ana 332 Cobalt EOS Video Yes Cohu Fiber Centracs Online Sycamore St Ped Xing 90 90 90 Free Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Bush St 90 90 90 Free Santa Ana 332 2070 ASC/3 Video Yes Copper Centracs Online French St 90 90 90 Free Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Mortimer St (PHB) 90 90 90 Free Santa Ana 332 Co balt EOS Video Yes Fiber EVP Centracs Online Lacy St 90 90 90 Free Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 15
Cycle Length Equipment
Corridor Cross Street Intersection AM MID PM WKND
Maintenance
Responsibility Cabinet Type Software Detection
Bike
Detection CCTV
Power
Backup Comm Other ITS ATMS Status
Garfield St (PHB) 90 90 90 Free Santa Ana 332 Co balt EOS Video Yes Fiber EVP Centracs Online Santiago St 90 90 90 Free Santa Ana 332 Cobalt EOS Video Yes Axis Fiber EVP Centracs Online 4th Street
French St 100 Free 100 Free Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online Mortimer St 100 Free 100 Free Santa Ana 332 Coba lt EOS Video Yes Fiber EVP Centracs Online Lacy St 100 Free 100 Free Santa Ana 332 Cobalt EOS Video Yes Fiber EVP Centracs Online I-5 SB Ramp 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Copper EVP Centracs Online I-5 NB Ramp 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Copper EVP Centracs Online Cabrillo Park Dr 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Fiber EVP Centracs Online Golden Circle Rd 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Copper EVP Centracs Online McFadden Ave
Newhope St 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops Yes Axis Fiber EVP Centracs Online Riverview Mktpl 70 Free 70 Free Santa Ana P (TS1) Cobalt EOS Loops No Fiber Centracs Online Jackson St 70 Free 70 Free Santa Ana P (TS1) Cobalt EOS Loops No Fiber EVP Centracs Online Mohawk Dr 70 Free 70 Free Santa Ana 332 Cobalt EOS Loops No Wireless Centracs Online Sullivan St 70 65 70 Free Santa Ana P (TS1) Cobalt EOS Loops No Copper Centracs Online Center St 70 65 70 Free Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Raitt St 140 130 140 Free Santa Ana 332 Cobalt EOS Loops No Axis Fiber EVP Centracs Online Pacific Ave 70 65 70 Free Santa Ana 332 Cobalt EOS Loops No Fiber EVP Centracs Online Shelton St 70 65 70 Free Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Flower St 140 130 140 Free Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online Broadway 70 65 70 Free Santa Ana 332 Cobalt EOS Loops Yes Fiber EVP Centracs Online Orange Ave 140 Free 140 Free Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Maple Bike Trail 70 65 70 Free Santa Ana 332 Cobalt EOS Loops Yes Copper Centracs Online Standard Ave 140 130 140 Free Santa Ana 332 Cobalt EOS Loops No Copper Bluetooth Centracs Online Hathaway St 70 65 70 Free Santa Ana P (TS1) Cobalt EOS Loops No Copper Centracs Online Lyon St 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops No Axis Fiber EVP Centracs Online Metrolink Xing Free Free Free Free Santa Ana 332 2070 ASC/3 Video No BBS Copper Centracs Online Newhope St
Kent Ave 140 130 140 Free Santa Ana P (TS1) 2070 ASC/3 Loops Yes Axis Fiber Bluetooth, EVP Centracs Online Camille St Free Free Free Free Santa Ana 332 2070 ASC/3 Loops Yes Fiber EVP Centracs Online 5th St 140 130 140 Free Santa Ana 332 2070 ASC/3 Loops Yes Cohu Fiber EVP Centracs Online Hazard Ave 140 130 140 Free Santa Ana P (TS1) 2070 ASC/3 Loops No Copper EVP Centracs Online Raitt St
Civic Center Dr 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online 5th Street Free Free Free Free Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online Santa Ana Blvd 70 Free 70 Free Santa Ana 332 Cobalt EOS Video Yes Axis BBS Fiber EVP Centracs Online Glenwood Pl 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Copper EVP Centracs Online St. Gertrude Pl 70 Free 70 Free Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online Adams Str 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Wireless EVP Centracs Online Alton Ave 70 Free 70 Free Santa Ana P (TS1) 2070 ASC/3 Video No Fiber EVP Centracs Online Flower St
Washington Ave 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Wireless Centracs Online 10th St (PHB) 70 Free 70 Free Santa Ana 332 Co balt EOS Video Yes Fiber EVP Centracs Online 6th St 100 100 100 Free Santa Ana 332 2070 ASC/3 Loops No Copper Centracs Online 3rd St (PHB) 70 Free 70 Free Santa Ana 332 Cobalt EO S Video Yes Fiber Centracs Online Walnut St 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops Yes Fiber EVP Centracs Online Bishop St 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Copper Centracs Online Highland St 70 Free 70 Free Santa Ana P (TS1) 2070 ASC/3 Loops No Copper Centracs Online Wilshire Ave 70 Free 70 Free Santa Ana P (TS1) 2070 ASC/3 Loops Yes Fiber EVP Centracs Online Anahurst Pl 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Fiber EVP Centracs Online Bike Trail 70 Free 70 Free Santa Ana P (TS1) 2070 ASC/3 Other No Copper Centracs Online Alton Ave 70 Free 70 Free Santa Ana 332 2070 ASC/3 Video Yes Copper Centracs Online EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 16
Cycle Length Equipment
Corridor Cross Street Intersection AM MID PM WKND
Maintenance
Responsibility Cabinet Type Software Detection
Bike
Detection CCTV
Power
Backup Comm Other ITS ATMS Status
Central Business District Downtown Signals 90 90 90 Free Santa Ana 332 2070 ASC/3 Loops No Fiber Copper Centracs Online Broadway
Santa Clara Ave 100 Free 100 Free Santa Ana 332 2070 ASC/3 Loops Yes Copper Centracs Online Buffalo Ave 100 Free 100 Free Santa Ana 332 2070 ASC/3 Loops No UPS Fiber EVP Centracs Online 15th St 140 Free 140 Free Santa Ana P (TS1) 2070 ASC/3 Loops No Copper EVP Centracs Online Washington Ave 90 90 90 90 Santa Ana 332 2070 ASC/3 Loops No Fiber Centracs Online 10th St 90 90 90 90 Santa Ana 332 2070 ASC/3 Loops Yes Fiber Centracs Online 5th St 90 90 90 90 Santa Ana 332 Cobalt EOS Loops No Fiber Centracs Online 4th St 90 90 90 90 Santa Ana 332 Cobalt EOS Loops No Copper Centracs Online 3rd St 90 90 90 90 Santa Ana 332 2070 ASC/3 Loops Yes Copper Centracs Online Standard Ave
Chestnut Ave 70 Free 70 Free Santa Ana P (TS1) 2070 ASC/3 Loops Yes Copper Centracs Online Bishop St 70 Free 70 Free Santa Ana 332 Coba lt EOS Video Yes Fiber Centracs Online Wakeham Ave (PHB) 70 Free 70 Free Santa Ana 332 Cobalt EOS Video Yes Fiber Centracs Online Hobart St 70 Free 70 Free Santa Ana 332 2070 ASC/3 Loops No Copper Centracs Online St. Gertrude Pl 70 Free 70 Free Santa Ana P (TS1) Cobalt EOS Loops No Copper Centracs Online

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 17

Three-Year Capital, Operations and Maintenance Plans

The City is committed to providing a high level of effort to maintain its traffic signals, signal systems and related communication infrastructure. The effort will include funding for proper maintenance, operations and upgrade of traffic signals to current standard where necessary.

Table 3 (3 Year Outlook - Constrained)
outlines a constrained budget which
includes activities planned for the next
three years that have full funding
identified. Funding includes approved
Project P, Federal and State
allocations identified in the current CIP.

Table 4 (3 Year Outlook -
Unconstrained) lists an unconstrained
budget which includes the constrained
budget as well as unconstrained
projects that could be implemented in
the next three if funding were available.

The 3-year outlook will help identify
preliminary project priorities and
potential multi-agency coordination
opportunities. Expenditures are shown
in year-of-expenditure dollars.

Table 5 (Candidate Signal
Synchronization Project) identifies
planning level capital funding needs for
a full buildout of Santa Ana’s Advance
Traffic Management System network
as shown in Figure 1 of section two of
the LSSP. This is a comprehensive list
of improvements planned without an
identified period.

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 18
Table 3 – 3 Year Outlook Traffic Signal Synchronization, Funding Needs for Synchronized Operations (City of Santa Ana, Constrained)

Maintenance
Project FY26/27 FY27/28 FY28/29 Total
Traffic Signals
Maintenance $1,200,000 $1,200,000 $1,200,000 $3,600,000 Communication
Maintenance $115,000 $115,000 $115,000 $345,000
Traffic Signal Utility $350,000 $350,000 $350,000 $1,050,000 Traffic Signal System
Maintenance $290,000 $290,000 $290,000 $870,000
Subtotal Maintenance $1,955,000 $1,955,000 $1,955,000 $5,865,000 Construction
Project FY26/27 FY27/28 FY28/29 Total
Traffic Signal
Equipment
Replacement
$150,000 $150,000 $150,000 $450,000
New LT Phasing $700,000 $700,000 $700,000 $2,100,000 4th St TSSP $200,000 $200,000
17th/ Westminster TSSP $500,000 $500,000
Subtotal Construction $1,050,000 $850,000 $1,350,000 $3,250,000 Operations
Project FY26/27 FY27/28 FY28/29 Total
KGG TSSP $12,320 $12,320
Bristol TSSP $13,440 $13,440
4th St TSSP $10,340 $10,340
Subtotal Operations $12,320 $13,440 $10,340 $36,100
TOTAL $3,017,320 $2,818,440 $3,315,340 $9,151,100

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 19
Table 4 – 3 Year Outlook Traffic Signal Synchronization, Funding Needs for Synchronized Operations (City of Santa Ana, Unconstrained)

Maintenance
Project FY26/27 FY27/28 FY28/29 Total
Traffic Signals
Maintenance $1,700,000 $1,700,000 $1,700,000 $5,100,000 Communication
Maintenance $175,000 $175,000 $175,000 $525,000
Traffic Signal Utility $400,000 $400,000 $400,000 $1,200,000 Traffic Signal System
Maintenance $350,000 $350,000 $350,000 $1,050,000
Subtotal Maintenance $2,625,000 $2,625,000 $2,625,000 $7,875,000 Construction
Project FY26/27 FY27/28 FY28/29 Total
Traffic Signal Equipment
Replacement $350,000 $350,000 $350,000 $1,050,000
CCTV Upgrades $100,000 $100,000 $100,000 $300,000
Controllers Upgrades $100,000 $100,000 $100,000 $300,000 System Detection
Upgrades $150,000 $150,000 $150,000 $450,000
Video Detection Upgrades $200,000 $200,000 $200,000 $600,000 APS Push Buttons $300,000 $300,000 $300,000 $900,000 UPS Upgrades $200,000 $200,000 $200,000 $600,000
Fairview St Conduit and
Comm
$700,000 $700,000
Newhope St Conduit and
Comm
$500,000 $500,000
Main St Conduit and
Comm $500,000 $500,000 $1,000,000
17th/Westminster Conduit
and Comm $500,000 $500,000
1st St Conduit and Comm $500,000 $500,000 $1,000,000 Subtotal Construction $1,400,000 $3,600,000 $2,900,000 $7,900,000 Operations
Project FY26/27 FY27/28 FY28/29 Total
Citywide Traffic Signal
Synchronization $1,500,000 $1,500,000
Advance Traffic Signal
Performance Measure $500,000 $500,000 $500,000 $1,500,000 Transit Signal Priority $500,000 $500,000 $500,000 $1,500,000 Emergency Vehicle Priority $500,000 $500,000 $500,000 $1,500,000 Subtotal Operations $1,500,000 $1,500,000 $3,000,000 $6,000,000 TOTAL $5,525,000 $7,725,000 $8,525,000 $21,775,000

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 20
Table 5 – LSSP Implementation, Candidate Signal Synchronization Projects with Estimated Costs

Corridor Improvement Summary Estimated
Costs
Westminster Ave/
17th St
Upgrade timing, controllers, CCTV, cabinets, system detection, video detection, communication, active transportation, UPS, travel time system and TMC improvements
$5,000,000
Fairview St
Upgrade timing, controllers, CCTV, cabinets, system detection, video detection, communication, active transportation, UPS, travel time system and TMC improvements
$5,000,000
Raitt St
Upgrade timing, controllers, CCTV, cabinets, system detection, video detection, communication, active transportation, UPS, travel time system and TMC improvements
$2,300,000
Newhope St
Upgrade timing, controllers, CCTV, cabinets, system detection, video detection, communication, active transportation, UPS, travel time system and TMC improvements
$3,500,000
Main St
Upgrade timing, controllers, CCTV, cabinets, system detection, video detection, communication, active transportation, UPS, travel time system and TMC improvements
$3,500,000
Flower St
Upgrade timing, controllers, CCTV, cabinets, system detection, video detection, communication, active transportation, UPS, travel time system and TMC improvements
$3,500,000

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 21
IV. Traffic Signal Synchronization
Assessment, Review and Revision

Maintaining efficient traffic operations throughout Santa Ana and surrounding area is a core objective of the City’s traffic management program. Signal synchronization is a key strategy in achieving this objective. To support reliable operations, the City regularly repairs, upgrades, and maintains critical components of the traffic signal system, including controllers, cabinets, communication systems, and detection equipment. In addition to synchronization of all the major arterials in the City, the City also collaborates with neighboring agencies to coordinate operations along inter-jurisdictional corridors.

Travel time and stop reduction, average speed and gas savings have been the normal parameters the City used to measure the success of synchronization. The City has supported the use of Corridor Synchronization Performance Index (CSPI) established by OCTA shown in Figure 4 to measure the inter-jurisdiction corridor performance. The CSPI utilizes parameters such as average speed, ratio of green to red signals and stops per mile to compile the score and grade for the entire corridor. The sum of the scores from each of the categories gives the total of the index. The CSPI value is categorized into five levels – Tier I through V. Tier I refers to a CSPI score at or above 80 and indicates very good signal synchronization conditions. Tier II with value of 70 to 80 is considered good progression with few stops and good travel time. Tier III with score 60-70 is considered the baseline for good operational performance. CSPI value ranging from 50 to 60 indicates a problem generally fixable with a low-cost solutions or signal timing modification. A CSPI below 50 however, indicates poor corridor performance thereby necessitating larger scale investigation into corridor operations.

Figure 4- CSPI Score and Description

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 22

Over the past three years from 2023 to 2026, the City, in cooperation with OCTA and other local agencies, participated in synchronizing several important corridors in the City and adjacent jurisdictions. Many corridors have been previously synchronized and maintained, however due to changes in traffic patterns, periodical re-timing is necessary to maintain progression and reduce delay.

Since 2023, The following corridors were synchronized or currently in the process of implementation:

 Synchronization for the First Street-Bolsa Avenue and Tustin Avenue-Rose Drive Corridors were completed in 2024.
 Synchronization for the Warner Avenue Corridor was completed in 2025.  Synchronization for the MacArthur Boulevard Corridor was completed in 2026.  Synchronization for the Edinger Boulevard Corridor was completed in 2026.  Synchronization for the Segerstrom Avenue/Dyer Road Corridor was completed in 2026.

A. Performance Results:

The primary objective of improving traffic flow along each synchronized corridor was achieved across all corridors included in recent synchronizations efforts. Improvements were observed in all key performance measures, including reduced travel times, fewer stops, higher average speeds, and improved green-to-red- signal ratios. These enhancements collectively indicate more efficient progression and better overall corridor performance.

A summary of these improvements is shown on Table 6 (Traffic Signal Synchronization Assessment, Review & Revision). These results are based on findings from the ‘Before’ and ‘After’ Studies conducted as part of the Primary Implementation Phase Reports for each project. The assessment breaks down the performance by corridor, direction of travel, and time of day, providing a detailed evaluation of operational changes resulting from the synchronization efforts.

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 23
Table 6 - Traffic Signal Synchronization Assessment, Review & Revision

Local Agency Corridor Year
Timing
Updated
Timing Update Results
Direction Peak Travel Speed (mph) Greens per Red Stops per Mile CSPI Score CSPI Tier Before After Before After Before After Before After Before After Barranca Parkway / Dyer
Road / Muirlands
Boulevard / Segerstrom
Avenue / Slater Avenue
2024
EB
AM 21.6 23.4 1.8 2.8 1.6 1.2 56.0 70.1 4.0 2.0
MD 23.7 26.6 1.8 3.0 1.6 1.2 60.3 77.8 4.0 3.0
PM 19.7 24.5 1.4 2.8 1.7 1.1 49.3 72.9 5.0 2.0
WKND 24.5 26.0 1.9 2.1 1.4 1.3 63.5 67.8 3.0 3.0
WB
AM 23.2 24.8 1.8 2.1 1.5 1.3 59.2 65.9 4.0 3.0
MD 24.2 26.6 2.0 2.6 1.5 1.3 64.5 74.7 3.0 2.0
PM 20.1 20.9 1.5 2.2 1.6 1.3 50.8 61.1 4.0 3.0
WKND 23.7 26.5 1.6 2.7 1.5 1.1 57.8 74.9 4.0 2.0
First Street / Bolsa Avenue 2024
EB
AM 19.0 22.0 1.8 3.2 1.8 1.2 49.8 71.7 5.0 2.0
MD 22.8 24.4 2.9 4.2 1.2 0.9 70.4 86.0 2.0 1.0
PM 19.0 21.4 1.9 3.2 1.6 1.1 51.9 71.1 4.0 2.0
WKND 20.0 23.7 2.2 3.9 1.6 0.9 56.5 83.2 4.0 1.0
WB
AM 21.9 26.1 1.9 4.8 1.6 0.7 57.1 95.4 4.0 1.0
MD 22.6 23.9 1.9 3.7 1.5 0.9 58.7 81.0 4.0 1.0
PM 19.0 22.1 1.5 3.3 1.9 1.1 46.3 73.7 5.0 2.0
WKND 20.5 23.1 1.8 3.7 1.6 1.0 54.0 80.0 4.0 1.0
Tustin A
venue / Rose Drive
2024
NB
AM 24.0 24.5 2.2 2.5 1.4 1.3 65.2 69.2 3.0 3.0
MD 24.4 26.5 2.2 3.7 1.3 0.9 65.9 85.3 3.0 1.0
PM 21.1 22.8 2.0 2.7 1.5 1.2 58.1 69.2 4.0 3.0
WKND 26.1 27.3 2.6 4.0 1.2 0.9 72.3 89.1 2.0 1.0
SB
AM 19.4 23.5 1.6 2.8 1.8 1.3 49.3 70.5 5.0 2.0
MD 24.0 29.1 1.9 4.3 1.5 0.8 61.6 94.5 3.0 1.0
PM 21.8 26.2 2.0 3.0 1.4 1.1 59.4 77.0 4.0 2.0
WKND

23.3 27.4 1.4 3.3 1.8 1.0 53.6 82.4 4.0 1.0
EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 24
Local Agency Corridor Year
Timing
Updated
Timing Update Results
Direction Peak Travel Speed (mph) Greens per Red Stops per Mile CSPI Score CSPI Tier Before After Before After Before After Before After Before After Warner Avenue 2025
EB
AM 22.6 25.8 1.8 2.9 1.4 1.0 59.6 76.6 4.0 2.0
MD 27.5 30.2 2.8 3.9 0.9 0.8 79.6 93.4 2.0 1.0
PM 25.3 25.6 2.2 3.0 1.1 0.9 69.7 78.3 3.0 2.0
WKND 28.1 28.8 2.8 2.8 0.9 0.9 81.0 81.6 1.0 1.0
WB
AM 22.3 25.7 1.7 2.8 1.3 0.9 58.7 77.1 4.0 2.0
MD 24.3 30.4 2.0 4.0 1.2 0.7 65.8 95.2 3.0 1.0
PM 20.1 21.7 1.6 2.1 1.5 1.2 52.3 62.1 4.0 3.0
WKND 25.4 28.5 2.5 2.9 1.0 0.9 72.7 82.5 2.0 1.0
Edinger Avenue 2026
EB
AM 18.8 24.2 1.5 4.8 1.5 0.7 50.5 92.5 4.0 1.0
MD 24.6 21.8 1.7 4.5 1.2 0.7 63.6 86.0 3.0 1.0
PM 2O.8 19.6 2.0 4.0 1.3 0.8 59.3 78.9 4.0 2.0
WKND 21.7 21.4 1.1 4.8 1.6 0.7 51.0 88.1 4.0 1.0
WB
AM 21.0 24.0 1.3 4.8 1.4 0.7 52.1 92.1 4.0 1.0
MD 26.2 22.4 2.4 4.8 1.1 0.7 72.9 89.8 2.0 1.0
PM 20.1 18.3 2.5 3.0 1.2 0.9 63.5 67.3 3.0 3.0
WKND 22.6 21.4 1.6 4.5 1.3 0.7 58.8 86.3 4.0 1.0
MacArthur Boulevard 2026
EB
AM 19.5 25.5 2.1 2.6 1.2 1.0 64.3 76.1 4.0 3.0
MD 25.5 28.5 2.8 3.1 1.0 0.9 78.4 83.8 3.0 2.0
PM 18.0 22.5 2.2 2.8 1.2 1.0 63.7 75.4 4.0 3.0
WKND 18.0 24.0 1.2 1.6 1.7 1.4 51.3 62.5 5.0 4.0
WB
AM 19.5 30.0 2.7 3.8 1.0 0.8 71.2 92.8 3.0 1.0
MD 24.0 28.5 2.8 4.2 1.0 0.7 76.9 94.9 3.0 1.0
PM 13.5 24.0 1.7 3.5 1.4 0.8 53.4 83.6 5.0 2.0
WKND 21.0 21.0 2.0 2.1 1.3 1.2 64.0 65.8 4.0 4.0

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 25
In cooperation with OCTA, the City also plans to adopt and implement a new, data-driven methodology based on probe-vehicle speed data. Under this methodology, average operating speed is compared with the corridor’s free-flow speed to calculate an Adjusted Level of Service (LOS). This metric provides a high-level indication of corridor performance, capturing the effects of travel time, progression quality, and the frequency of stops.

Average travel speed also indirectly reflects fuel consumption and emissions, offering an additional indi cator of operational efficiency.

Corridors operating at speeds closer to free-flow conditions receive higher Adjusted LOS ratings, while those operating at lower speeds indicate reduced coordination efficiency and may warrant signal timing updates or additional review. To ensure consistenc y in evaluating performance, the following Adjusted LOS criteria are applied:

Using these criteria, the City evaluated each synchronized corridor by comparing its average percent of free-flow speed during the AM, Mid-day, and PM peak periods. The results are summarized in Table 7, which assigns an Adjusted Level of Service to each corridor and highlights locations where progression is strong, as well as corridors where reduced travel speeds indicate the need for timing updates or additional operational review. The route number identified in the table corresponds to the OCTA route identification.

EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 26
Table 7 - Santa Ana 2026 Corridor Synchronization Performance Summary:

Route
Numb
er Route Name

AM MD PM AM MD PM
Route
Length
(mile)
330
GARDEN GROVE BLVD (E) To GOLDENWEST ST to W MEMORY LN (E) From N BRISTOL ST 74.0 67.4 64.5 C D D 7.100
331
W MEMORY LN (W) To N BRISTOL ST to GARDEN GROVE BLVD (W) From GOLDENWEST ST 75.3 66.8 63.5 C D D 7.101
332
E 2ND ST (E) Between ISLAND VILLAGE DR and WESTMINSTER BLVD to E 17TH ST (SE) To EL CAMINO LN 72.7 67.0 64.8 C D D 16.750
333 E 17TH ST (NW) From EL CAMINO LN to E 2ND ST (W) From WESTMINSTER BLVD 75.1 68.4 64.8 C D D 16.735 334 BOLSA AVE (E) Between BOLSA CHICA ST and BOLSA CHICA ST to E 1ST ST (E) 75.5 70.7 69.1 C C D 11.591 335
E 1ST ST (W) From CABRILLO PARK DR to BOLSA AVE (W) Between BOLSA CHICA ST and BOLSA CHICA ST 78.0 72.5 69.0 C C D 11.589
336 EDINGER AVE (E) Between BOLSA CHICA ST and BOLSA CHICA ST to EDINGER AVE (SE) 73.4 68.2 66.3 C D D 14.624 337
EDINGER AVE (NW) From IRVINE CENTER DR to EDINGER AVE (W) Between BOLSA CHICA ST and BOLSA CHICA ST 76.4 71.4 66.6 C C D 14.634 338
WARNER AVE (E) Between PACIFIC COAST HWY and PACIFIC COAST HWY to WARNER AVE (SE) To RED HILL AVE 70.1 65.7 64.9 C D D 13.290
339
WARNER AVE (NW) From RED HILL AVE to WARNER AVE (W) Between PACIFIC COAST HWY and PACIFIC COAST HWY 72.9 66.8 63.8 C D D 13.296
340
W SEGERSTROM AVE (E) Between S HARBOR BLVD and S HARBOR BLVD to E DYER RD (SE) To RED HILL AVE 78.0 75.1 75.1 C C C 4.548
341
E DYER RD (NW) From RED HILL AVE to W SEGERSTROM AVE (W) Between S HARBOR BLVD and S HARBOR BLVD 77.6 71.4 67.9 C C D 4.547
342
TALBERT AVE (SE) Between BEACH BLVD and BEACH BLVD to MACARTHUR BLVD (SW) To E COAST HWY 72.1 66.6 65.4 C D D 14.623
343 MACARTHUR BLVD (NE) to TALBERT AVE (W) Betw een BEACH BLVD and BEACH BLVD 73.6 65.9 62.8 C D D 14.624 366 EUCLID ST (NE) to S EUCLID ST (N) To W IMPERIAL HWY 71.6 65.3 61.3 C D D 15.871 367 S EUCLID ST (S) From W IMPERIAL HWY to EUCLID ST (SW) 72.1 67.8 66.1 C D D 15.862 368 HARBOR BLVD (NW) Between NEWPORT BLVD and NEWPORT BLVD to N HARBOR 70.8 63.8 58.6 C D E 21.561 EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 27
Route
Numb
er Route Name

AM MD PM AM MD PM
Route
Length
(mile)
BLVD (NE) To PEPPERTREE DR
369
N HARBOR BLVD (N) to HARBOR BLVD (NW) Between NEWPORT BLVD and NEWPORT BLVD 70.4 65.0 63.6 C D D 21.729
372 FAIRVIEW RD (N) From NEWPORT BLVD to FAIRVIEW ST (N) To GARDEN GROVE BLVD 71.9 66.9 60.2 C D D 8.440 373 FAIRVIEW ST (S) From GARDEN GROVE BLVD to FAIRVIEW RD (S) To NEWPORT BLVD 71.5 70.8 68.9 C C D 8.442 378 BRISTOL ST N (NW) to N BRISTOL ST (N) 72.3 67.0 59.2 C D E 9.124 379 N BRISTOL ST (N) to BRISTOL ST S (SE) 72.1 67.9 63.9 C D D 9.211 382
MAIN ST (NW) Between JAMBOREE RD and JAMBOREE RD to N MAIN ST (N) To W TAFT AVE 69.7 62.5 58.2 D D E 10.386
383
N MAIN ST (S) From W TAFT AVE to MAIN ST (SE) Between JAMBOREE RD and JAMBOREE RD 71.2 66.7 63.9 C D D 10.384
384 S GRAND AVE (NE) From E DYER RD to N KRAEMER BLVD (N) To E LAMBERT RD 72.6 64.7 63.2 C D D 15.038 385 N KRAEMER BLVD (S) From E LAMBERT RD to S GRAND AVE (SW) To E DYER RD 72.3 67.0 66.6 C D D 15.044 386 TUSTIN AVE (N) To W 1ST ST to N ROSE DR (N) From E IMPERIAL HWY 76.0 71.5 68.3 C C D 11.252 387 N ROSE DR (S) To E IMPERIAL HWY to TUSTIN AVE (S) From W 1ST ST 75.9 72.9 72.0 C C C 11.243 447 E 4TH ST (E) From N TUSTIN AVE to TRABUCO RD (E) To MARGUERITE PKWY 68.5 62.8 61.7 D D D 15.132 448 TRABUCO RD (W) From MARGUERITE PKWY to E 4T H ST (W) To N TUSTIN AVE 69.8 63.7 61.8 D D D 15.123 554 S GRAND AVE (NE) From E DYER RD to S GLASSELL ST (N) To E LA VETA AVE 68.1 61.3 59.3 D D E 5.029 555 S GLASSELL ST (S) From E LA VETA AVE to S GRAND AVE (SW) To E DYER RD 67.8 66.1 66.4 D D D 5.029 EXHIBIT 4

SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN| 28
B. System Improvements:

In addition to the corridor synchronization,
improvements to the traffic signal system,
communication and monitoring infrastructure
were made along the following corridors to allow
the City to better monitor traffic condition,
manage traffic signals and maintain signal
synchronization.

1. Tustin Ave / Rose Dr Corridor:

Improvements include upgrading
controllers to ATC, installing fiber
optic cable, installing Ethernet
switches, installing CCTV cameras,
and upgrading traffic signal cabinets.

2. Edinger Ave Corridor:

Improvements include upgrading
controllers to ATC, installing CCTV
cameras and VDS, installing conduit
and fiber optic cable, installing
Ethernet switches, ATMS License
expansion, and Signal Performance
Measures.

3. Warner Ave Corridor:

Improvements include upgrading
controllers to ATC, installing CCTV
cameras and VDS, installing conduit
and fiber optic cable, installing
Ethernet switches, installing
Bluetooth travel systems, replacing
traffic signal cabinets, ATMS License
expansion and Signal Performance
Measures.

4. MacArthur Blvd Corridor:

5. Segerstrom/Dyer Corridor:

Improvements include upgrading
controllers to ATC, installing CCTV
cameras and VDS, installing conduit
and fiber optic cable, Ethernet
switches, and Signal Performance
Measures.

6. 1
st St / Bolsa Ave Corridor:

Improvements include upgrading
controllers to ATC, installing CCTV
cameras and VDS, installing APS,
installing conduit and fiber optic
cable, installing Ethernet switches,
replacing traffic signal cabinets, and
Signal Performance Measures.

7. Kraemer-Glassell-Grand Corridor:

Improvements include upgrading
controllers to ATC, installing CCTV
cameras and VDS, installing APS,
installing fiber optic cable, installing
Ethernet switches, installing wireless
radios, Signal Performance
Measures, and TMC improvements.

8. McFadden TSP:

Improvements include installing a
cloud-based Transit Signal Priority
(TSP) system with secure controller
communication and centralized
system management at 19
intersections.

9. Bristol Street Corridor:

Improvements include upgrading
controllers to ATC, installing CCTV
and VDS, installing APS, install
Ethernet switches, and TMC
improvements including relocating
and installing equipment into the new
TMC and implementing a new video
wall.

EXHIBIT 4

Santa Ana City CouncilJune 2, 2026

Santa Ana City Council
June 2, 2026