TC - Item 3A - Draft Citywide Engineering and Traffic SurveyROSEMEAD TRAFFIC COMMISSION
STAFF REPORT
TO: TRAFFIC COMMISSION
FROM: CHRIS MARCARELLO, PUBLIC WORKS DIRECTOR
DATE: MARCH 7, 2013
SUBJECT: DRAFT CITYWIDE ENGINEERING AND TRAFFIC SURVEY
SUMMARY
The California Vehicle Code requires that the City conduct a citywide speed analysis
(Engineering and Traffic Survey) of local streets every seven (7) years. This requirement
helps to ensure the proper posting of speed limits and also enables the Sheriffs
Department to utilize radar or other electronic speed measuring devices for speed
enforcement efforts. To meet this requirement, staff coordinated an analysis to evaluate
the existing speed zones within the City of Rosemead. At its February meeting, the
Commission reviewed the Engineering and Traffic Survey and asked for an additional
review of 5 local streets. This information is summarized for your review.
Staff Recommendation
It is recommended that the Traffic Commission:
1. Review and approve the draft Citywide Engineering and Traffic Survey establishing
speed limit zones; and
2. Recommend approval of the Engineering and Traffic Survey to the City Council.
DISCUSSION
The California Vehicle Code (CVC) establishes certain speed limits based on specific
criteria. These are called prima facie speed limits. A blanket speed limit of 15 mph is
established on all alleys, blind intersections, and at blind railroad crossings. The 25 mph
speed limit may be established under the following conditions: 1) On any business or
residential district; 2) At school zones, when children are present, and; 3) In senior zones.
The California Department of Transportation requires that the criteria set forth in the
California Manual on Uniform Traffic Control Devices (CA MUTCD) be utilized in the
establishment of speed limits. This manual requires that a speed limit be set closest to the
85 percentile speeds. The 85 percentile speed is the speed at or below which 85% of
the traffic travels. This threshold represents what is historically found to be a safe and
reasonable speed for most drivers based on common roadway conditions. Based on data
collected in an engineering and traffic survey, a speed limit is established at the nearest 5-
mile per hour increment to the 85 percentile speed. The CA MUTCD does allow for
certain conditions to warrant lower speeds, if necessary. In reviewing speed zones and
making recommendations, several criteria is considered, including the 85 percentile of
Traffic Commission Meeting
March 7, 2013
Pape 2 of 3
existing speed conditions, accident history, roadway conditions, pedestrian activity, and
speed limits in neighboring jurisdictions.
A copy of the Engineering and Traffic Survey is included with this report. The report was
completed under the direction of a licensed traffic engineer and includes a significant
amount of data collection including speed sampling, a review of accident histories, roadway
conditions, traffic characteristics and land use. Based on a review of this information, the
survey includes the recommendation of reducing speeds on 4 of the streets surveyed as
follows:
The survey indicated that each of these street segments was recommended for a
decreased speed based on 85 percentile speed threshold levels.
At its February meeting, the Traffic Commission asked for the additional review of 5 local
streets. After review of these streets it was determined that 4 streets were eligible for a
reduction in speed limit due to roadway characteristics (California Manual for Traffic Control
Devices, Option 2).
6 _ T
Del Mar Avenue
Garvey Avenue
Hellman Avenue
40
35
Ellis Lane
Olney Street
Temple City
30
25
Marshall Street
Rosemead
Boulevard
35
30
Mission Drive
Walnut Grove
Rosemead
40
35
Mission Drive
Avenue
Boulevard
40
35
San Gabriel
Garvey Avenue
Hellman Avenue
40
35
Boulevard
Mission Drive
North City Limit
40
35
The survey indicated that each of these street segments was recommended for a
decreased speed based on 85 percentile speed threshold levels.
At its February meeting, the Traffic Commission asked for the additional review of 5 local
streets. After review of these streets it was determined that 4 streets were eligible for a
reduction in speed limit due to roadway characteristics (California Manual for Traffic Control
Devices, Option 2).
After further review of these findings, it is recommended that the Traffic Commission concur
with the survey findings and recommend approval by the City Council.
be Adelena
Rosemead
Ellis Lane
30
25
Street
Boulevard
Marshall Street
Rosemead
Hart Avenue
35
30
Boulevard
Mission Drive
Rosemead
Valley
40
35
Boulevard
Boulevard
Walnut Grove
Mission Drive
North City Limit
40
35
Avenue
After further review of these findings, it is recommended that the Traffic Commission concur
with the survey findings and recommend approval by the City Council.
Traffic Commission Meeting
March 7, 2013
Page 3 of 3
FINANCIAL REVIEW
Funding for the radar survey was included in the City's Fiscal Year 2013 operating budget.
Submitted by:
Chris Marcarello
Director of Public Works
Attachments:
1- Draft Citywide Radar Speed Survey
speed violations are actually violations of the basic speed law (Section 22350 of California
Vehicle Code). This statute states that a person shall not drive a vehicle at a speed greater
than is safe having regard for traffic, roadway, and weather conditions. A prima facie limit
is intended to establish a maximum safe speed under normal conditions.
Table 1 identifies the street segments with recommended changes in posted speed limits
and Table 2 summarizes the recommendations for all surveyed segments.
TABLE 1
STREET SEGMENTS WITH RECOMMENDED SPEED CHANGES
No
STREET
FROM
TO
EXISTING
NEW
CHANGE
1
DE ADELENA ST
ROSEMEAD BLVD
ELLIS LANE
30
25
DECREASE
3
DEL MAR AVE
GARVEY AVE
HELLMAN AVE
40
35
DECREASE
5
ELLIS LANE
OLNEY ST
TEMPLE CITY BLVD
30
25
DECREASE
19
MARSHALL ST
ROSEMEAD BLVD
HART AVE
35
30
DECREASE
22
MISSION DR
WALNUT GROVE AVE
ROSEMEAD BLVD
40
35
DECREASE
23
MISSION DR
ROSEMEAD BLVD
VALLEY BLVD
40
35
DECREASE
32
SAN GABRIEL BLVD
GARVEY AVE
HELLMAN AVE
40
35
DECREASE
42
V1P11 UTGF QEAVE
MISSION DR
NORTH CITY LIMIT
40
35
DECREASE
Engineering and Traffic Survey
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