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 2 lane highway adjacent to school can be described by the
Greenshield's model. A length of 0.50 km adjacent to a school is described as a school zone and operates
for a period of 25 minutes 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 21 kph. Data collected at the site when school zone is
not in operation show that the jam density and mean free for each lane is 119 veh/km and 65 kph
respectively. If the demand flow on the highway at the time of the operation of the school zone is 95% of
the capacity of the highway, calculate the following:
2.1 Traffic shockwave created by the operation of the school zone
2.2 The queue length of vehicles affected by the school zone operation
2.3 The number of vehicles affected by the school zone operation
2.4 The time the queue of vehicles takes for it to dissipate after the operation of the school zone
2.5 Plot the…
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
Studies have shown that the traffic flow on a two-lane road adjacent to aschool can be described by the Greenshields model. A length of 0.5 miadjacent to a school is described as a school zone and operates for a periodof 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 showthat the jam density and mean free speed for each lane are 125 veh/mi and57 mi/h. If the demand flow on the highway at the times of operation ofthe school zone is 90% of the capacity of the highway, determine:
The speeds of the shock waves created by the operation of the schoolzone, and• The number of vehicles affected by the school zone in the upsream ofthe zone during this 30-minute operation.
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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