A developer wants to provide access to a new building from a driveway placed 1000 ft upstream of a busy intersection. He is concerned that queues developing during the red phase of the signal at the intersection will block access. If the speed on the approach averages 35 mi/hr, the density is 50 veh/mi, and the red phase is 20 sec, determine if the driveway will be affected. Assume that the traffic flow has a jam density of 110 veh/mi and can be described by the Greenshields model.
What will be an ideal response?
The red phase of the traffic signal creates a stopping shock wave. The speed of a
stopping shock wave is given by Equation 6.52, as follows:
In 20 seconds, the wave will have traveled backward (toward the driveway in question)
(23.4)(20) = 468 ft, therefore not reaching the driveway.
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