The through movement passenger car equivalents (pcphpl) for each approach of Vine and Maple Streets intersections obtained from a traffic survey as shown in the following diagram. Vine Street for NS movements 1s 48 ft wide and Maple Street for EW movements is 60 ft wide. There are two through movement lanes and one left-tum lane in each approach. The yellow times for Vine Street and Maple Street through movement and left-tum phases are 4 second and 3 seconds per g_hase, respectively. The All-red for each phase is 2.0 seconds and the ost time is 5 seconds per phase. Pedestrian walkmg speed is 3.5 ft/sec. Assuming equal distribution of traffic on the two through-movement lanes in each approach and a saturation flow rate of 1,900 pcphpl. A 3-phase fixed timing signal plan (namely, a protected left-turn phase, a NS phase, and an EW phase) is suggested. I) In the diagram, the through movement volume is for 2 lanes and left tum volume is for one-lane. 2) Determine one N-S or E-W left tum phase on the basis of the highest left tum volumes. 3) The remaining two left tum volumes shall be converted to through movement equivalents and be combined with respective 2-lane through movement volumes. Determine the cycle length for this 3- Phase intersection
The through movement passenger car equivalents (pcphpl) for each approach of Vine and Maple Streets
intersections obtained from a traffic
movements 1s 48 ft wide and Maple Street for EW movements is 60 ft wide. There are two through
movement lanes and one left-tum lane in each approach. The yellow times for Vine Street and Maple
Street through movement and left-tum phases are 4 second and 3 seconds per g_hase, respectively. The
All-red for each phase is 2.0 seconds and the ost time is 5 seconds per phase. Pedestrian walkmg
speed is 3.5 ft/sec. Assuming equal distribution of traffic on the two through-movement lanes in each
approach and a saturation flow rate of 1,900 pcphpl. A 3-phase fixed timing signal plan (namely, a
protected left-turn phase, a NS phase, and an EW phase) is suggested.
I) In the diagram, the through movement volume is for 2 lanes and left tum volume is for one-lane.
2) Determine one N-S or E-W left tum phase on the basis of the highest left tum volumes.
3) The remaining two left tum volumes shall be converted to through movement equivalents and be
combined with respective 2-lane through movement volumes.
Determine the cycle length for this 3- Phase intersection
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