. THE CORPORATION OF THE CITY OF PORT COQUITLAM

COUNC
MEMORANDUM =

NOV 2 198;
TO: B. Kirk, October 26, 1981
City Administrator

FROM: F.E. Peters,
City Engineer

SUBJECT: Shaughnessy/Lougheed Intersection
Public Works Committee, October 20th, 1981

RECOMMENDATION:

: That the Department of Highways be requested to provide
two left-turn lanes in the northbound direction on Shaughnessy
Street at Lougheed Highway.

BACKGROUND AND COMMENTS ;

The Public Works Committee had been asked to consider
further solutions to the problems of traffic turning on Fraser Avenue.
One of the reasons that traffic is turning on Fraser Avenue is
because there is not sufficient left turn Capacity in the nortnbound |
direction on Shaughnessy Street. Rather than wait for two or three
cycles for the left turn signal, people go straight through the inter-
section and then come back southbound to make a right turn onto the
Lougheed Highway.

. There is no technical reason why one of the through lanes
could not be made into an additional left-turn lane. Depending on
the proportion of traffic making the various different maneuvers,
it may be necessary for the additional left-turn lane to also operate
as a through lane. If this is the case it would be necessary to
change the sequence and Operation of the traffic signal controller

to eliminate the phase which allows two Opposing left turn movements
to take place at the same time. .

The disadvantage of a dual left-turn lane is that it can
be expected to create additional accidents at the intersection
because of a conflict between the two lanes. This additional risk
is normally accepted in return for the additional capacity which is
provided by the dual left-turn lane.

The operation of this intersection and traffic signal is
entirely within the jurisdiction of the Department of Highways.
Therefore, if we agree that it would he des'‘~-able to have a dual left-
turn lane, we would have to approach the Department of Highways and
request that they undertake the work. Department of Highways policy
is that the City pay a Proportion of all costs at intersections