THE CORPORATION OF THE CITY OF PORT COQUITLAM

MEMORANDUM

TO: B.R. Kirk November 22nd, 1982.
City Administrator

FROM: F.E. Peters, P.Eng.,
City Engineer

SUBJECT: Traffic Control on Bailey Bridge

RECOMMENDATICN:

THAT no change be made to the traffic control on the Bailey
Bridge,

AND THAT some additional signs be installed to inform people
of the need to stop at the signal stop line to actuate the traffic

signal.

BACKGROUND AND COMMENTS:

This is a report on traffic control requested by Council
after two weeks of operation over the new single lane bridge. Although
there have been a number of problems during the-two week period
including a malfunctioning signal, long trains, and drivers who did not
pull up to the stop line, it appears that there has been some stabilizatior
of travel patterns and what is happening out there now is probably a
reasonable picture of the way it will work in the future.

For about twenty hours of every week day, the City bridge
operates with only minor delays to traffic in both directions. These
delays are necessary simply because the signal alternates the traffic.
However, traffic approaching from either direction during these times
normally would not have to wait more than one signal cycle. During two
of the remaining four hours of the day, the peak direction traffic. gets
through with not more than a one cycle wait but the off peak direction
must wait several cycles. The remaining two hours require both directions
to wait more than one cycle. However, the signal is adjusted in such
a way that the peak direction normally has a wait of no longer than
three cycles whereas the off peak direction may have to wait six or
seven cycles. What these figures mean in terms of minutes is that
the average delay to the peak direction traffic during the peak two
hours of every week day is about four to six minutes and for the non
peak direction, about twelve to fifteen minutes.

The above delay figures assume that the present volumes of
traffic continue. The amount of traffic being handled now is somewhat
less than would normally be handled by two-way bridge. In the peak
direction the capacity of the bridge is 80% of normal peak traffic
but in the off peak direction the capacity is only 50% of normal peak

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GOR