If a four-phase operation is used for the intersection of Willow and Stevens wit

Question

If a four-phase operation is used for the intersection of Willow and Stevens with a time of 80 seconds, including 15 seconds for the turn (LT) vehicles on each street, 30 and 20 seconds for left Willow and Stevens, respectively, construct the through (TH) vehicles for the signal timing cut-out diagrams for the vehicles. Assume a clearance (Yellow 3 se + All Red 2 sec) time of 5 seconds and All Red used between LT and TH in same direction. The width of Stevens Avenue is 52 feet. How long should be the Flash Don't Walk (FDW) duration if the walking speed of pedestrians is 4 feet/sec?

Explanation / Answer

b)

A pedestrian will begin to cross the street just as the DON'T WALK signal begins to flash.

hence

DON'T WALK Duration is 52/4 = 13 sec

for part a) please specify the type of diagram

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