0.5 mile School Zone
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Studies have shown that the traffic flow on a two-lane road adjacent to a school can be described by the Greenshields model. A length of 0.5 mi adjacent to a school is described as a school zone (see the figure) and operates for a period of 30 min just before the start of school and just after the close of school. The posted speed limit for the school zone during its operation is 15 mi/h. Data collected at the site when the school zone is not in operation show that the jam density and mean free speed for each lane are 122 veh/mi and 61 mi/h. If the demand flow on the highway at the times of operation of the school zone is 90% of the capacity of the highway, determine the following.
A diagram of a long, horizontal two-lane road is viewed from above, where traffic goes to the right in the bottom lane and to the left in the top lane. The middle section of this stretch of road is labeled "0.5 mile School Zone" and is bounded by two vertical lines.
(a)the velocity of the shock wave created by the operation of the school zone (Enter the velocity of the backward forming shock wave in mi/h. Indicate the direction with the sign of your answer.)_____________mi/h
(b)the number of vehicles affected by the school zone during this 30-minute operation__________vehicles

Transcribed Image Text:0.5 mile
School Zone
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