HomeMy WebLinkAbout9/7/2011 - STAFF REPORTS - 2.K. �OEpAIM sp9
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Date: September 7, 2011 CONSENT CALENDAR
Subject: APPROVAL OF PLANS, SPECIFICATIONS AND ESTIMATE (PS&E)
AND AUTHORIZATION TO BID FOR THE 2010/2011 TRAFFIC SIGNAL
IMPROVEMENTS, CITY PROJECT 10-07
From: David H. Ready, City Manager
Initiated by: Public Works and Engineering Department
SUMMARY
The Public Works and Engineering Department has scheduled improvements to three
existing traffic signals. The construction documents (Plans, Specifications and
Estimate) are completed and, in accordance with 7.03.040 of the Procurement and
Contracting Code the Council is required to approve and adopt plans, specifications and
working details, and authorize the bid request for all public projects in excess of
$100,000. Approval of this project will allow staff to proceed with this public project, with
an estimated cost of approximately $180,000.
RECOMMENDATION:
Approve the plans, specifications and working details for the 2010/2011 Traffic Signal
Improvements, City Project 10-07, and authorize staff to advertise and solicit bids.
STAFF ANALYSIS:
The Public Works and Engineering Department included modification of three existing
traffic signals in the 2010/2011 fiscal year budget. The three intersections are:
Indian Canyon Drive at San Rafael Road
Ramon Road at Sunrise Way
Ramon Road at Farrell Drive
The Public Works and Engineering Department has inventoried existing traffic signals
that should be modified to install protected/permissive signal phasing. In the past, it
was common to install a full-functioning 8-phase traffic signal (allowing traffic movement
in each direction of a four-way intersection, and for each left-turn phase). However, the
industry has subsequently analyzed ways to improve the efficiency of traffic movement
ITEM NO. 11
City Council Staff Report
September 7, 2011 -Page 2
2010/2011 Traffic Signal Improvements (CP10-07)
on arterial streets, and determined that removal of protected phasing where not required
drastically decreases delay of vehicles at signalized intersections.
A protected/permissive signal is one that has a five-section vehicle head on the signal
mast arm, shown at right below, and has a five-section vehicle head on the far pole,
shown at left below:
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Y Y Y
G Q Q
Y
G
This type of signal phasing allows traffic to move through the intersection more
efficiently, giving left-turning vehicles a "permissive" movement, allowing the turn when
there are no opposing vehicles. In a true "protected" phase, a vehicle must wait for the
green arrow to make the movement, whether or not there is opposing traffic.
Previously, staff had identified and converted most of the City's existing traffic signals to
permissive, or protected/permissive signal phasing. At these intersections, existing
protected phasing on one or both approaches is converted to permissive phasing, or
protected/permissive phasing; and in certain cases where protected phasing is
warranted, protected/permissive phasing is added. Other modifications are proposed,
including the addition of video detection systems, emergency vehicle preemption
systems, ADA audible pedestrian bush button assemblies, and uninterrupted power
supply systems (to keep the signals operational during power outages).
The plans and specifications have been prepared by the City's engineering consultant
(RBF Consulting), and are ready for Council approval and the subsequent
advertisement for construction bids.
Section 7.03.040 of the Procurement and Contracting Code requires that for public
projects in excess of$100,000 Council approve and adopt the plans, specifications and
working details, and authorize staff to advertise for construction bids. The Engineer's
Estimate for this project is $180,000. Approval of the recommended action will allow
staff to proceed with bidding of this project.
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City Council Staff Report
September 7,2011 -Page 3
2010/2011 Traffic Signal Improvements(CP10-07)
FISCAL IMPACT:
Funding for this project is made available through local Measure A funds in account
134-4498-50294 and 134-4498-50300. No local miscellaneous General Funds are
being used for this project.
SUBMITTED:
Prepared by: Recommended
Recommended by:
Marcus L. Fuller David J. Barakian
Assistant Director of Public Works Director of Public Works/City Engineer
Approved by: l
Thomas J. Wils , Asst. City Manager David H. Ready, C ager
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