Item 2 4-Way Stop Cambridge & MapleFO _
O R
2 AGENDA ITEM
Q .
C DUPlT`1 GQ' - :
February 13,- 201.9
TO: City Traffic Commission
THRU: :Frank Sun, City Engineer
FROM: Dave Allenbach ,_Transportati.on.Analyst
REVIEW: Assistant Traffic Engineer: Public -Works Director
1.
A request for the installation of a four -way stop control at the intersection of:Cambridge
Street and Maple Avenue.
2. SUMMARY
The requested - four -way stop control is to enhance traffic safety by assigning right-of way
at the subject'intersection.
3. RECOMMENDED ACTION: - -:
Approve -the installation the four -way stop control at the intersection of Cambridge: Street- and Maple Avenue.
_. - - - . ...... . ... ......
4. FISCAL IMPACT
The total expenditure for the project is $ 1,000 and:will be funded in Minor Traff ic Control
Devices (11 6302) through Traffic Improvement Measure M2 (263).
5. STRATEGIC PLAN GOALS
Goal:: Provide for a safe community
b. Provide and maintain infrastructure necessary to ensure th.e safety of the public.
6. DISCUSSION AND BACKGROUND
This request.is from Ms. Sue.Vaurs who is representing several residents of the, 100 and
200 blocks of : North Cambridge Street. The residents of the area have had several issues
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related to traffic on Cambridge Street. Staff has been working with - the. residents for a year
and has addressed .all of their concerns with the exception of the installation of a four
way stop at the subject intersection which requires action from the Traffic Commission. It
should be noted that the subject intersection was evaluated in 1991, 1992 and 2002 for
the: installation of a four -way stop - control. Pursuant : to this latest request from the
neighborhood;-another traffic study was conducted at this location. The results are as
follows::
ITEM 2 1 02/13/2019
Existinq Conditions
The subject intersection has not changed since 2002. East —west traffic on Maple Avenue
is still controlled by a two -way stop and there have been no changes to roadway alignment
or striping.
Accident History
The accident history at the subject intersection was reviewed for the past three year
period. Our records indicate that there have been seven accidents at the subject
intersection in that period of time and are illustrated 'in the table below:
Year
No. of Accidents
Right Angle
Other Collision Type
Inju
2016
5
4
1
2
2017
0
0
0
0
2018
2
2
0
2
The subject intersection averages 2.6 accidents per year; the majority of those reported
accidents are right angle type accidents which are correctible by a four -way stop control.
The minimum warrant for consideration of a four -way stop based on accident history is
three correctible accidents in - a calendar year.
Traffic Volume Characteristics -
Turning movement counts were conducted at the subject intersection during the AM and
PM peak traffic hours. There were a total of 564 vehicles entering the intersection from
all approaches during the AM peak hour between 7:30 and 8:30 AM with a ratio of 3.7 to
1 and 631 vehicles were counted during the PM peak hour between 4:30 and 5:30 PM
with a ratio of 4.5 to 1. The minimum traffic warrant for traffic volume is 250 vehicles and
a ratio of not more than 3 to 1. The average delay for motorists entering Cambridge Street
from Maple Avenue is approximately 16.5 seconds during the AM Peak Hour and 13.3
seconds during the PM Peak.
Intersection Alignment and Design
Cambridge Street and Maple Avenue intersect at a ninety degree angle with good sight
distance for all approaches.
Findings and Conclusions
The intersection of Cambridge Street and Maple Avenue does not meet the minimum
warrants for the installation of a four -way stop, however the accident history and traffic
volume characteristics are within 70 percent of those two warrants. Furthermore, our
observations indicate that traffic on Cambridge Street will not have excessive delays
should a four -way stop control be installed at the subject intersection. Lastly, the majority
of accidents at the subject intersection in the past five year period have been right angle
accidents which is correctable by a four -way stop control.
Recommendation
Based on the results of this traffic study, it is staff's opinion that the installation of a four -
way stop at the subject intersection would be prudent at this time. It is staff's
recommendation that the request for a four -way stop control at the intersection of
Cambridge Street and Maple Avenue be approved.
ITEM 2 2 02/13/2019
All residents living within 300 feet of the intersection were notified of the Traffic
Commission Meeting.
7. ATTACHMENTS
1. Letter of Request
2. Area Map
3. Site Sketch
ITEM 2 3 02/13/2019