Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 6, Problem 16P
To determine
(a)
The speeds of the shock waves created by the operation of the school zone.
To determine
(b)
The number of vehicles affected by the school zone during this 30-minute operation.
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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…
Problem.
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 Figure 6.19) 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 20 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 118 veh/mi and 63 mi/h. If the demand flow on the highway at the times of
operation of the school zone is 95% of the capacity of the highway, determine:
6-13
(a) The speeds of the shock waves created by the operation of the school zone
(b) The number of vehicles affected by the school zone operation
(c) The time the queue takes for it to dissipate after the operation of the school zone
Chapter 6 Solutions
Traffic and Highway Engineering
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - The arrival times of vehicles at the ticket gate...Ch. 6 - Prob. 27P
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