TC - Item 3A - Lower Azusa Road Rosemead Blvd Right Turn Only LaneROSEMEAD TRAFFIC COMMISSION
TO: TRAFFIC COMMISSION
STAFF REPORT
FROM: CHRIS MARCARELLO, PUBLIC WORKS DIRECTOR
JOANNE ITAGAKI. TRAFFIC CONSULTANT
DATE: NOVEMBER 4, 2010
SUBJECT: LOWER AZUSA ROAD /ROSEMEAD BOULEVARD —WESTBOUND
RIGHT TURN ONLY LANE
SUMMARY
A request was received to review the intersection of Lower Azusa Road /Rosemead
Boulevard. The request was for the installation of a westbound right turn only lane on
Lower Azusa Road at Rosemead Boulevard. Since this intersection is under the
jurisdiction of Caltrans (and shared with the City), it is appropriate to initiate discussions
with Caltrans to accommodate any lane or signal modifications.
Staff Recommendation
It is recommended that the Traffic Commission:
1. Recommend to Caltrans that a westbound right turn only lane be installed at
Lower Azusa Road /Rosemead Blvd (including the development of a signal
modification plan, encroachment permit for lane modifications, relocation of
existing signal detector loops and "cat- track" striping through the intersection);
2. Recommend to the City Council that the westbound right turn only lane, adjusted
lane widths, and red curbing be installed to accommodate a dedicated right turn
only lane.
ANALYSIS
Lower Azusa Road is approximately 56 feet wide with two lanes of traffic in each
direction separated by a double yellow centerline. Parking is generally allowed except
during street sweeping times. The posted speed limit is 40 mph.
The intersection of Lower Azusa Road /Rosemead Boulevard is signalized with timing
under the jurisdiction of Caltrans. The westbound leg of the intersection (Lower Azusa
TRAFFIC COMMISSION MEETING
November 4, 2010
Page 2 of 2
Road) is striped with a left turn lane and a shared left -right turn lane. Field observation
of the intersection identified a heavy westbound to southbound left turn movement from
Lower Azusa Road. The current signal timing provided ample time to "clear' all the
westbound movements. The observation also indicated that many westbound right turn
vehicles on Lower Azusa Road would "sneak" through the curb lane to turn right onto
Rosemead Boulevard. This curb lane is approximately 18 feet wide.
The overall width of Lower Azusa Road at Rosemead Boulevard is approximately 56
feet. A restriping of this leg of the intersection could accommodate an additional
westbound lane by "shifting" all lanes southerly. Exhibit A depicts the existing and
proposed lane configuration on Lower Azusa Road at Rosemead Boulevard.
The proposed lane configuration would provide westbound dual left turn lanes and a
right turn only lane. There would be two eastbound lanes provided. The proposed lane
configuration would likely require a relocation of signal detector loops and the
installation of red curbing along the south side of Lower Azusa Road.
Due to the intersection's control by Caltrans, a signal modification plan and
encroachment permit will be required to complete the proposed lane configuration. In
addition, Caltrans could require the proposed lane configuration follow the minimum
width requirements of the Highway Design Manual. The existing street width would not
be able to accommodate the required Highway Design Manual lane widths (11 or 12
foot left turn lanes and 14 foot right turn lane).
To improve the traffic circulation at the intersection of Lower Azusa Road /Rosemead
Boulevard, it is recommended that a westbound right turn only lane and adjusted lane
widths be installed for westbound Lower Azusa Road. This recommendation will likely
require a signal modification plan to be approved by Caltrans to relocate existing signal
detector loops and "cat- track" striping through the intersection.
Submitted by:
Chris Marcarello
Public Works Director
Joanne Itaga" ki
Traffic Consultant
Attachment 1: Exhibit A — Lane Configuration
Attachment 2: Neighborhood Overview and On Street Conditions
011J07470/Traffic Commission AgendastKl Dl11 November/Lower Azusa - Rosemead WB RT Only lane.doc
City of Rosemead
Traffic Commission Meeting
November 4, 2010
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NOT TO SCALE
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LOWER AZUSA ROAD
18 112— — —
18' I,12'
LEGEND
Black lines = Existing Lane Configuration
Red lines = Proposed Lane Configuration
Exhibit A
Lower Azusa Road at
Rosemead Boulevard
Westbound Right Turn
Only Lane
Existing and Proposed
Lane Configuration
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