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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
2 ACHMENT 1��'
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.
s
• 3. Minimum Length Uninterrupted by Stop Signs or Traffic Signals - 800 feet. • Previously was 1,500 feet
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• 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. Not a priority route for emergency services.
•
•
a bus route.
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
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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TrurnpER.ATE.
Street Length: 750 feet
24-hour speed survey on
8/18/2020
• 85th Percentile Speed: 32 mph
• Average Daily Traffic: 294
vehicles/day
*****
PLACENTIA •
All MATIIICA CITY
• V 0,,
MENT 1
Traffic Calming Improvements
Hemingway Avenue, cont.
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
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
ATTACHMENT 1
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.
ATTACHMENT
Questions?
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