Faulkner Drive. Neighborhood residents requested the City install a series of speed humps and stop signs to control vehicle speeds. Staff conducted a 24-hour speed survey in August 2020 and the data indicated at that time that vehicle speeds were normal. However, the City did install edge/centerline striping around the T -intersection to encourage motorists not to cut the corner and risk a collision with an approaching vehicle at that intersection.
Hemingway Avenue did not qualify for speed humps based upon the existing speed hump guidelines at that time and neighborhood residents remained in communication with Staff and City Council members, both of which met residents onsite to discuss their concerns. In May 2021, pursuant to another request from neighborhood residents, the City conducted a seven-day speed survey which is six (6) days more than the typical standard speed survey. The results of the seven- day survey were consistent with the previous one -day speed survey data and did not indicate any speeding issues are present in the neighborhood. Regardless, the City installed a series of traffic calming measures in the form of new edge striping, centerline striping, and new speed limit signs and legends designed to constrict travel lanes to encourage motorist to slow down as an incremental approach to addressing neighborhood concerns. Once the traffic calming improvements were installed, Staff advised residents that the City would conduct a new speed survey six (6) months later to gauge the effectiveness of the traffic calming measures.
The residents on Cobb Avenue first approached Staff in fall 2020 expressing the concerns of vehicles speeding on their street and requested the City to install a number of speed humps on Cobb Avenue between McCormack Lane and Spahn Lane. These residents also submitted a signed petition from the neighborhood requesting the humps. Staff conducted a 24-hour speed survey in September 2020 and the data indicated the street did indeed have a legitimate speeding concern, however the street does not meet the remaining minimum requirements for speed hump consideration either under the previous guidelines or the updated policy. However, again utilizing an incremental approach to addressing speeding concerns, the City implemented a series of traffic calming improvements by installing edge/centerline striping along with new speed limit signs and speed legends on Cobb Avenue.
In December 2021, two-day speed counts were collected on Cobb Avenue and seven-day speed counts were collected on Hemingway Avenue. The speed data in the tables below show that the incremental approach to managing neighborhood speeding concerns have been effective in reducing the vehicle speeds, particularly on Cobb Avenue.
Cobb Avenue
85th percentile speed
Average speed
Average Daily Traffic
September - 2020
(Pre -Improvement)
36 mph
23 mph
240 vehicles per day
December - 2021
(Post Improvement)
26 mph
20 mph
135 vehicles per day
City Council Agenda
April 5, 2022
Hemingway Avenue
85th percentile speed
Average speed
Average Daily Traffic
August - 2020
(Pre -Improvement)
32 mph
25 mph
294 vehicles per day
May - 2021
(Pre -Improvement)
32 mph
25 mph
250 vehicles per day
December - 2021
(Post Improvement)
31 mph
24 mph
290 vehicles per day
In addition to the physical traffic calming improvements the Police Department also deployed motor units as part of a speed enforcement detail but did not issue any citations.
On July 20, 2021, the City Council approved a formal Speed Hump Installation Policy that updated the evaluation process and design criteria for the installation of speed humps as well as adopting an incremental approach toward implementing traffic speed mitigation measures to address residential traffic and/or speeding concerns. Speed humps have been used as a traffic calming device in various locations around the City to help reduce neighborhood vehicle speeds and cut - through traffic. They provide a vertical change in the roadway intended to reduce the speed of vehicles traveling along that road. Because physical alteration to the roadway pavement is required for installing speed humps, there are some disadvantages associated with speed humps.
As a result, some jurisdictions have adopted a phased approach to neighborhood traffic management i that includes non-physical roadway improvements such as those installed on Cobb and Hemingway Avenues as incremental improvements to reduce vehicle speeds and improve safety. These kinds of improvements include any traffic calming measure that does not require significant physical changes to the roadway. Non-physical traffic calming improvements such as edge and centerline striping and posted speed limit signs are intended to increase drivers' awareness of surroundings and influence driver behavior and are designed and implemented as incremental solutions before considering physical changes to the roadway.
A detailed presentation summarizing the traffic conditions before and after the improvements on Hemingway and Cobb Avenues were completed is attached to this agenda report. Staff presented this before and after study to the Streetscape and Transportation Advisory Commission ("STAC") on January 24, 2022. In addition to the adopted Speed Hump Policy, the development of an in- depth Neighborhood Traffic Management Toolkit ("NTMT") is underway. Staff shared a working outline of a proposed NTMT with the STAC for their input on January 24, 2022. With the Commission's input a draft of the proposed NTMT will be presented to the City Council for its consideration and formal adoption at a future date. The recently adopted Speed Hump Policy will be included in the final draft of the NTMT.
Prepared by: Reviewed an
Kyra Tki-004.
ao
Transportation Manager
Luis Estevez
Deputy City Administrator
City Council Agenda
April 5, 2022
Reviewed
a s. roved:
Damien R. Arrula
City Administrator
Attachment:
Presentation — Hemingway and Cobb Avenue Traffic Calming Improvements
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Hemingway and Cobb Avenue Traffic
Calming Improvement Update
April 5, 2022
ATTACHMENT 1
Presentation Outline
1. Background
2. Adopted Speed Hump Policy
3. Incremental Neighborhood Traffic Calming Approach
4. Hemingway Avenue Traffic Calming Improvements
5. Cobb Avenue Traffic Calming Improvements
6. Before and After Study Summary
Background
• Hemingway and Cobb Avenue residents began contacting staff in 2020 to report speeding issues and' share traffic safety concerns and requested the installation of speed humps and stop signs to reduce traffic speeds
• Staff conducted multiple speed surveys on both streets to verify if the data collected confirmed speeding issues existed
• Staff with the Public Works and Police Departments met with neighborhood residents in the field to discuss their concerns • Utilizing a data -driven incremental approach to addressing neighborhood speeding/traffic concerns, Staff identified and implemented a series of traffic calming improvements on both streets that yielded reduced traffic speeds
Speed Hump Installation Policy
Speed Hump Installation Policy
• Pursuant to a recommendation made by the Streetscape and Transportation Commission, on July 20, 2021, the City Council unanimously adopted a revised Speed Hump Installation
Program and incorporated the updated Policy No. 623 into the City's Administrative Policy Manual
• The revised policy updated the criteria for identifying qualified streets for the installation of speed humps and reduced some qualifying standards to allow for more potential streets to be considered, as well as updated the public notification process and other design standards
Speed Hump Policy, cont.
Eligible Street Criteria:
• 1. Local - Street shall not be designated as an arterial or collector on City, County, State or Federal plans.
• 2. Residential - Majority of abutting development shall be fronting or side -on single family residential.
• 3. Minimum Length Uninterrupted by Stop Signs or Traffic Signals - 800 feet. • Previously was 1,500 feet
•
= 4. Maximum Average Daily Traffic Volume - 3,000 vehicles. •
• 5. Maximum Speed Limit - 25 miles per hour.
• 6. Minimum Speed Profile - 85th percentile speed must exceed 35 miles per hour. 7 Nota priority route for emergency services.
•
•
oute.
Pros and Cons of Speed Humps
PROs:
• Reduces traffic speeds
• Discourages neighborhood cut-
through
ut-
through traffic
• Relatively inexpensive when
compared to other traffic calming
measures
a IV
CONS:
• Delays emergency response times
• Increases traffic volumes on adjacent streets (transfers cut - through traffic)
• Increases noise levels
• Potential liability for property damage or personal injury
Incremental Traffic Calming Approach
The City utilizes an incremental, data -driven
phased approach to implementing traffic
calming measures that begins with collecting
speed survey data to first determine if a
speeding issue indeed exists
PHASE I: NON-PHYSICAL IMPROVEMENTS
• Centerline/Edge Line Striping
• Signage
• Speed Legend
• Speed Radar Trailer
• Police Enforcement
PHASE 1I: PHYSICAL IMPROVEMENTS
• Speed Hump
• Raised Crosswalk
• Traffic Circle/Roundabout
• Curb Extension
• '_
Stop Sign Installation Regulations
Stop Sign Installation Regulations
■ Installation of stop signs governed by the California Manual of Uniform Traffic Control Design (MUTCD)
■ Used to assign right-of-way and control vehicle/pedestrian conflicts near locations that generate high pedestrian volumes ■ Not used for Speed Control
■ Warrant Analysis Required:
❑ Crash Record — 5+ crashes in a 12 -month period that are susceptible to correction by a stop installation.
❑ Traffic Volumes - 300 vehicles per hour for any 8 hour of an average day • Vehicle Speed - 85th -percentile approach speed exceeds 40 mph
Neither street qualified for new stop signs pursuant to State MUTCD standards
Hemingway Avenue
Traffic Calming Improvements
Traffic Calming Improvements
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Hemingway Avenue
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Street Length: 750 feet
24-hour speed survey on
8/18/2020
• 85th Percentile Speed: 32 mph
• Average Daily Traffic: 294
vehicles/day
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PLACENTIA
MENT 1
Traffic Calming Improvements
Hemingway Avenue, cont.
8,
f
Double yellow centerline was
installed in September 2020 to
better channelize traffic turn
movements to address corner
cutting at the T intersection
24-hour speed survey from
5/26/2021 through 6/1/2021
▪ 85th Percentile Speed: 31- 32
mph
• Average Daily Traffic: 255
vehicles/day
Traffic Calming Improvements
Hemingway Avenue, cont.
Striping Improvement - Hemingway
Striping Improvement - Faulkner
Non -Physical Traffic Calming Improvement implemented in June 2021 on both Hemingway and Faulkner Avenues
3rd 24-hour speed survey conducted on Hemingway from 12/12/2021 to 12/18/2021 (six days total — standard is 24 -hours)
■ 85th Percentile Speed: 31 mph
■ Average Daily Traffic: 290 vehicles/day
MENT 1
Traffic Calming Improvements
Hemingway Avenue, cont.
Replaced Advance Warning Sign in December 2021 to increase motorist awareness of the cul-de sac ahead
Cobb Avenue
Traffic Calming Improvements
Traffic Calming Improvements
Cobb Avenue
Street Length: 650 feet
24-hour speed survey on 9/2/2020
■ 85th Percentile Speed: 35- 36 mph
■ Average Daily Traffic: 235
vehicles/day
Residents submitted speed hump
petition in October 2020 — street did not
meet minimum qualifications for speed
humps under old guidelines and still
does not meet them under the new
policy standards
17 ATTACHMENT1
Traffic Calming Improvements
Cobb Avenue, cont.
Street Length: 650 feet
Non -Physical Traffic Calming
Improvements implemented in May
2021
24-hour speed survey on 12/15/2021 and
12/17/2021
• 85th Percentile Speed: 26 mph
• Average Daily Traffic: 135
vehicles/day
Incremental Approach to Traffic
Calming
Before & After Comparisons
Traffic Calming Improvements
Before and After Summary
Cobb Avenue Sept- 2020 Dec -2021
(Pre -Improvement) (Post Improvement)
85th percentile speed 36 mph 26 mph
Average speed 23 mph 20 mph
Average Daily Traffic 240 vehicles per day 135 vehicles per day Hemingway Avenue
Aug -2020 May -2021 Dec -2021
(Pre -Improvement) (Pre -Improvement) (Post Improvement) 85th percentile speed 32 mph 32 mph 31 mph
Average speed 25 mph 25 mph 24 mph
Average Daily Traffic 294 vehicles per day 250 vehicles per day 290 vehicles per day The Police Department also deployed motor units to both neighborhoods on traffic enforcement details however no citations were issued.
Questions?
21 ATTACHMENT 1�