A stream of traffic is approaching a traffic signal with a speed of 50 mph, and density of 30 vpm. The jam density is 150 vpm. The red signal length is 10 seconds. Assume Greenshields model applies. 1. What is the stopping wave speed? [5 pts] 2. Determine the length of the queue of vehicles stopped at the end of the red phase. And then, based on the length of the queue, how many vehicles are stopped at that time? [5 pts] 3. What is the starting wave speed when a traffic signal turns green? [5 pts] 4. 5. Determine the queue dissipation speed. And then based on such dissipation speed, how long after the signal turns green will all vehicles be moving again? [5 pts] What is the additional length of queued or stopped vehicles due to arrivals after the signal turns to green? [5 pts] What is the distance from the stop line to the last vehicle joining the queue? [5 pts]

A stream of traffic is approaching a traffic signal with a speed of 50 mph, and density of 30 vpm. The jam density is 150 vpm. The red signal length is 10 seconds. Assume Greenshields model applies. 1. What is the stopping wave speed? [5 pts] 2. Determine the length of the queue of vehicles stopped at the end of the red phase. And then, based on the length of the queue, how many vehicles are stopped at that time? [5 pts] 3. What is the starting wave speed when a traffic signal turns green? [5 pts] 4. 5. Determine the queue dissipation speed. And then based on such dissipation speed, how long after the signal turns green will all vehicles be moving again? [5 pts] What is the additional length of queued or stopped vehicles due to arrivals after the signal turns to green? [5 pts] What is the distance from the stop line to the last vehicle joining the queue? [5 pts]

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter4: Traffic Engineering Studies

Section: Chapter Questions

Problem 15P

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