Sub-problem 4c - Page 2 of 4
Sub-problem 4c: Clifton Country Road 2004 PM - With vs.
In the PM Without condition, the interesting issue is the
intersectionís performance. This situation sets the standard against
which the PM With condition is compared.
Exhibit 2-46 shows the
performance of the intersection under four conditions: PM Without (Dataset
40); a PM With condition in which the site-generated flows
are at their expected values (Dataset
41); a PM With condition in which the site-generated traffic
is 30% greater than those expected values (Dataset 42); and a PM With condition in
which intersection enhancements have been made to improve the facilityís
In the PM Without
condition, the delays are substantial. They range from 13.7 to
62 seconds per vehicle, with many being above 50. The overall average
delay is 56.2 seconds per vehicle. The average queue lengths are
predominantly around 8-12 vehicles and the 95th percentile
queue lengths range up to 21 vehicles. Five of the v/c ratios are 0.80 or
The with condition makes the
situation worse. Delays are higher (the average delay is higher by 5.5 seconds per vehicle),
v/c ratios are higher, and queues are longer.
With Plus 30-Percent
will explore the impacts even further by examining a situation where
the site-generated traffic was 30% greater than projected.
That scenario is presented third. One movement (the eastbound through) now
has a v/c greater than 1.0, several movements are at LOS E, and the
overall intersection level of delay is 51
seconds per vehicle.
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