CC - Item 4I - Restriction on Mission Dr at Encinita AveE M F
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ROSEMEAD CITY COUNCIL
STAFF REPORT
TO: THE HONORABLE MAYOR AND CITY COUNCIL
FROM: OLIVER CHI, CITY MANAGER
DATE: JANUARY 22, 2008
SUBJECT: EASTBOUND LEFT TURN SIGNAL PHASE AND "NO U-TURN"
RESTRICTION ON MISSION DRIVE AT ENCINITA AVENUE
SUMMARY
On January 3, 2008, the Traffic Commission reviewed the traffic signal operation at the
intersection of Mission Drive and Encinita Avenue. At this meeting, the Commission
approved staffs recommendation that no traffic signal modifications be made and that
"No U-Turn" restrictions be added for eastbound traffic on Mission Drive at Encinita
Avenue.
Staff Recommendation
Staff recommends that the City Council approve the Traffic Commission's
recommendation to install "No U-Turn" restrictions for eastbound traffic on Mission Drive
at Encinita Avenue.
DISCUSSION
At the request of the Traffic Commission, staff conducted a traffic study for turning
movement counts at the intersection of Mission Drive and Encinita Avenue. Using state
guidelines, staff found that the intersection does not warrant traffic signal modifications
for eastbound traffic lanes on Mission Drive. Instead, the study did show that the
installation of "No U-Turn" signage is warranted for the intersection.
Attachment A includes a detailed report, traffic study, and intersection diagram.
FINANCIAL REVIEW
Not applicable
ENVIRONMENTAL REVIEW
Not applicable
LEGAL REVIEW
This staff report has been reviewed and approved by the City Attorney.
APPROVED FOR CITY COUNCIL AGENDA: 0
• •
City Council Meeting
January 22, 2008
Page 2 of 2
Prepared by:
Chris Marcarello
Administrative Services Officer
Submitt b
B ki
Assistant City Manager
Attachments:
(1) Traffic Commission Staff Report, 1/3/2008
11
ROSEMEAD TRAFFIC COMMISSION
STAFF REPORT
TO: THE HONORABLE CHAIRMAN AND COMMISSIONERS
FROM: JOANNE ITAGAKI, TRAFFIC ENGINEERING DEPUTY
DATE: JANUARY 3, 2008
SUBJECT. REQUEST FOR EASTBOUND LEFT TURN SIGNAL PHASE AND "NO
U TURN" RESTRICTION ON MISSION DRIVE AT ENCINITA AVENUE
SUMMARY
Commissioner Gay requested staff review the traffic signal operation at the intersection
of Mission Drive and Encinita Avenue. Commissioner Gay indicated he felt there was a
need to install eastbound left turn signal phasing (left turn arrow) and prohibit U turns in
this same direction.
Staff Recommendation
It is staff's recommendation that no traffic signal modifications (eastbound left turn
signal phasing) be made: to the intersection of Mission Drive and Encinita Avenue at this
time.
It is staffs recommendation that the Traffic Commission recommends the City Council
approve the installation of "No U Turn" restrictions for eastbound Mission Drive at
Encinita Avenue at this time.
ANALYSIS
Mission Drive is a 30-foot roadway traveling generally in an east/west direction through
the City. Therc are two lanes of traffic separated by a double yellow centerline. At its
intersection with Encinita Avenue, Mission Drive provides an eastbound left turn lane
onto northbound Encinita Avenue. Rosemead High School and Rosemead Park are
located on the north side of Mission Drive between Encinita Avenue and Rosemead
Boulevard. The posted speed limit on Mission Drive is 40 mph.
Encinita Avenue is a 43-foot wide north/south roadway. There is one lane of traffic in
each direction separated by single yellow skip striping. Rosemead Park is on the west
side and residential uses are on the east side of Encinita Avenue. Encinita Avenue is
signalized at its intersections with Mission Drive and Lower Azusa Road. Parking is
• •
Traffic Commission Meeting
January 3, 2008
Page 2 of 4
allowed on both sides of Encinita Avenue. The posted speed limit is 30 mph on Encinita
Avenue.
Exhibit "A" depicts existing conditions at the intersection of Mission Drive and Encinita
Avenue.
Discussion
Turning movement counts were taken at the intersection of Mission Drive and Encinita
Avenue during the 7:00 to 9:00 AM and 4:00 to 6:00 PM peak periods. These traffic
counts indicated that the peak hours occurred at 7:00 AM and 5:00 PM. There were no
eastbound U turns observed during the peak periods counted. Table 1 summarizes the
peak hour turning movement counts.
Data was collected regarding the eastbound left turn delay on Mission Drive at Encinita
Avenue. This data recorded the number of eastbound left turn vehicles waiting in the
red phase, turning on the green phase and turning on the yellow phase. The data was
taken during the AM and PM peak hour. Tables 2-AM and 2-PM summarize this
information_
Eastbound Left Turn Phase Analysis
The installation of left turn signal phasing is based guidelines provided in the California
Manual on Uniform Traffic Control Devices (CA MUTCD). The CA MUTCD indicates
that left turn signal phasing should be considered when one or more of the following
conditions exist:
1. Collisions - Five or more left turn collisions for a particular left turn movement
during a recent 12-month period.
2. Delay - Left-turn delay of one or more vehicles, which were waiting at the
t epinning of the green interval and are still remaining in the left turn lane after at
least 80% of the total number of cycles for one hour.
3. Volume - At new interser..tions where only estimated volumes are available, the
following criteria may be used. For pretimed signal or a background-cycle-
Controlled actuated signal, a left turn volume of more than two vehicles per
approach per cycle for a peak hour; or for a traffic-actuated signal, 50 or more left
turning vehicles per hour in one direction with the product of the turning and
conflicting through traffic during the peak hour of 100,000 or more.
4. Miscellaneous. Other factors that might be considered include but are not limited
m: impaired _ight distance due to horizontal or vertical curvature, or where there
are a large percentage of buses and trucks.
Collisions The reported collisions for the intersection of Mission Drive and Encinita
Avenue were revimved for the period from January 1, 2005 through February 28, 2007.
There were. 4 reported collisions during this period. None of these reported collisions
involved left turning vehicles at this intersection. Therefore, the collision guideline is not
satisfied.
• •
Traffic Commission Aleefing
January 3, 2008
Page 3 of 4
Delay - The delay analysis is provided in Tables 2-AM and 2-PM. During the AM peak
hour, 47 total cycles were observed. Of these 47 cycles, 7.experienced a delay. This is
14.9% of the total cycles being delayed. During the PM peak hour, 39 total cycles were
observed. Of these 39 cycles, only 1 experienced a delay. This is 2.6% of the total
cycles being delayed. Therefore, the delay guideline is not satisfied in the AM or PM
peak hour.
Volurne - This guideline is to be applied to new intersections. However, the volume
guideline was reviewed for informational purposes. During the AM peak hour, 173
eastbound vehicles turn left from Mission Drive onto Encinita Avenue. The volume of
conflicting westbound through traffic, is 525. This is a product of 90,825. During the PM
peak hour. 404 eastbmind vehicles turn left from Mission Drive onto Encinita Avenue.
The volume of conflicting westbound through traffic is 281. This is a product of 113,524.
Therefore, the AM peak hour does not satisfy the guideline but the PM peak hour
satisfies the guideline.
Miscellaneous - Fhere are no unusual conditions at this intersection that would satisfy
this particular guideline.
Recommendation
Based on the data rol!Pcted fnr.the eastbound !eft turns on Mission Drive at Encinita
Avenue, the installation of an eastbound left turn signal phase is not recommended at
this time.
_Eastbound "No U Turn" Prohibition
The turning movement and delay counts taken at the intersection of Mission Drive and
Encinita Avenue did not identify any vehicles executing eastbound U turns. The
reported rol!!.sion history does not identify any U-turn related collisions at this
intersection.
A general rule of thumb in, determining if U-turns can be "easily" made is to measure
from the outside: of fhe left turn lane to the curb (of opposing traffic). If this distance is
less than 42 feet, U-turns should probably be restricted.
The width of Mission Drive at E_.ncinita Avenue is 60 feet. The width from the outside of
the left turn lane to the curb is 35 feet, which is less than the 42 feet "rule of thumb".
Therefore, a "No 1.1 Turn" restriction is recommended for eastbound Mission Drive at
Encinita Avenue.
Recommendation
Based on the width of Mission Drive at Encinita ,Avenue, the installation of a "No U Turn"
restriction for eastbound Mission Drive at Encinita Avenue is recommended.
• •
Traffic Commission Meeting
January 3, 2008
Page 4 of 4
PUBLIC NOTICE PROCESS
This item has been noticed through the regular agenda notification process.
Submitted by:
Joanne-- Itagaki
Traffic Engineering Deputy
Exhibit A:
FxEstin 7 Conditions at Mission Drive and Encinita Avenue
Table 1:
7urriing Movement Counts
Table 2-AM:
AM Peak Hour Delay Uata
Table 2-PM:
PM Peak Hour Delay Data
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SCALE 1° = 50'
LEGEND
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EXHIBIT A
CITY OF ROSEMEAD
MISSION DRIVE AT
ENCINITA AVENUE
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TABLE 1
Mission Drive and Encintia Avenue
Turning Movement Counts
Count Date: Tuesday, November 20, 2007
AM Peak: 7:00 - 8:00
North Leg I 161
SB RT SB LT
372 107
ES LT 1731 1 76 WB RT
EB Tt I 28E 525 W-8T H
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Mission Dr. Mission Dr.
Dote: There were no eastbound U turns observed
during the 7:00-9:00 AM or 4:00-6:00 PM
peak -criods
PM Peak: 5:00 - 6:00
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