Hemingway and Cobb Avenue Traffic
Calming Improvement Update
March 15, 2022
ATTACHMENT 1
Presentation Outline
1. Background
2. Adopted Speed Hump Policy
3. Two -Phased Neighborhood Traffic Calming Approach
4. Hemingway Ave. Traffic Calming Improvements
5. Cobb Ave. Traffic Calming Improvements
6. Before and After Study Summary
ATTACHMENT 1
Background
HEMINGWAY AVENUE:
• The residents first contacted Staff in 2020 regarding vehicles speeding and cutting the corner at the Hemingway and Faulkner T -intersection. • Installed centerline striping around T -intersection to address the issue of vehicles cutting the corner.
• Implemented edge/centerline striping, speed limit sign and speed legend on Hemingway and Faulkner Streets in June 2021, to address the issue of vehicles speeding.
• Conducted speed survey three times in Aug 2020, May 2021, and Dec 2021, for a total of 15 days.
COBB AVENUE:
• The residents first contacted Staff in 2020 regarding vehicles speeding on Cobb Avenue.
■ Implemented edge and centerline striping, speed limit sign and speed legend in May 2021, to address the issue of vehicles speeding. • Conducted speed survey two times in Sept 2020 and Dec 2021, for a total of three (3) days.
ATTACHMENT 1
Speed Hump Policy
(Resolution No. R-2021-49)
ATTACHMENT 1
Speed Hump Policy
ELIGIBLE STREET:
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.
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 bus route or a priority route for emergency services.
ATTACHMENT 1
Speed Hump
PROS:
• Reduce traffic speeds — Traffic on
street with the speed hump
decreases by 20 to 25%
• Discourage neighborhood cut -
through traffic
• Relatively inexpensive when
compared to other traffic calming
measures
ti
CONS:
• Delay emergency vehicles response time
• Increase traffic volumes on adjacent streets
• Increase noise levels
• Street maintenance costs increase due to additional labor and materials
• Potential public liability for damaged vehicles and increased claims
ATTACHMENT 1
Two -Phased Traffic Calming Approach
PHASE NON-PHYSICAL IMPROVEMENTS
• Centerline/Edgeline Striping
• Signage
• Speed Legend
• Speed Radar Trailer
• Police Enforcement
PHASE PHYSICAL INTRUSIVE TREATMENTS
• Speed Humps
1. Raised Crosswalk
• Traffic Circle/Roundabout
• Curb Extension
1[1.11
WOlt,
STOP SIGN INSTALLATION REQUIREMENTS
• Installation of stop signs governed by the California Manual of Uniform Traffic Control Design
• 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
❑ 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
Hemingway Avenue
Traffic Calming Improvements
ATTACHMENT 1
Traffic Calming Improvements
Hemingway Avenue
r .r
• f
P ' I.tr
d
▪ •
•
t r;44 374
i
Viol noo
Street Length: 750 feet
24-hour speed survey on
Hemingway on 8/18/2020
'T„, ■ 85th Percentile Speed: 32 mph
• Average Daily Traffic: 294
vehicles/day
Crumpat Aga
foq:�in.
P AilNIIA
� rrn,ti
r+ I�
10 MENT 1
Traffic Calming Improvements
Hemingway Avenue
OPTION 2 /
REFLECTIVE MARKERS
11E ME 1
_4Z
Double yellow centerline was
installed in September 2020, to
address speeding and corner
cutting concerns at the T
intersection
24-hour speed survey on
Hemingway from 5/26/2021 to
6/1/2021
■ 85th Percentile Speed: 31- 32
mph
• Average Daily Traffic: 255
vehicles/day
F.
11 MENT 1
Traffic Calming Improvements
Hemingway/Faulkner Avenues
Striping Improvement - Hemingway
Striping Improvement - Faulkner
Non -Physical Traffic Calming Improvement implemented in June 2021
24-hour speed survey on Hemingway from 12/12/2021 to 12/18/2021 ■ 85th Percentile Speed: 31 mph
▪ Average Daily Traffic: 290 vehicles/day
12 ATTA MENT 1
Traffic Calming Improvements
Hemingway Avenue
Replaced Advance Warning Sign in December 2021, to increase motorist awareness of the cul-de sac
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 as well as
new policy standards
ATTACHMENT 1
Traffic Calming Improvements
Cobb Avenue
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
Phase 1 Improvements
Before & After Study
Traffic Calming Improvements
Before and After Summary
Cobb Avenue
85th percentile speed
Average speed
Average Daily Traffic
Hemingway Avenue
85th percentile speed
Average speed
Average Daily Traffic
Sept- 2020
(Pre -Improvement)
36 mph
23 mph
240 vehicles per day
Aug -2020
(Pre -Improvement)
32 mph
25 mph
294 vehicles per day
Dec -2021
(Post Improvement)
26 mph
20 mph
135 vehicles per day
May -2021
(Pre -Improvement)
32 mph
25 mph
250 vehicles per day
Dec -2021
(Post Improvement)
31 mph
24 mph
290 vehicles per day
Questions?