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MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305577398
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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Question
Chapter 6, Problem 24P
To determine
The resultant effect of a sudden reduction of the capacity on a highway due to a bottleneck using appropriate diagrams.
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Students have asked these similar questions
The relationship between flow and density on a four-lane highway (two lanes per direction) is
known to follow GreenShiled's model, with a free flow speed of 100 km/h and a jam density of
80 veh/km/lane. One of the two lanes of the EB direction will be closed for an entire month for
maintenance. The traffic demand for the highway on a typical weekday is shown in the table below.
a) What is the maximum length of the queue upstream of the bottleneck during both the
morning and afternoon peak hours?
b) At what time will the morning and afternoon queues be dissipated?
c) Draw the shock wave diagram (for the entire day) showing shock wave speeds, critical
times, and distances.
Time
7:00 AM - 9:00 AM
9:00 AM 3:00 PM
3:00 PM 7:00 PM
7:00 PM–11:00 PM
11:00 PM 7:00 AM
Average Demand (vph)
3000
1500
3200
1200
400
Traffic flow on a four-lane (one direction) freeway can be described by the Greenshields model. Two lanes of the four lanes on a section of this freeway will have to be closed to undertake an emergency bridge repair that is expected to take 2 hr. The mean free speed of the highway is 60 mi/h and the jam density is 140 veh/mi/ln. If it is estimated that the demand flow on the highway during the emergency repairs is 80% of the capacity, using the deterministic approach, determine: (a) The maximum queue length that will be formed (b) The total delay(c) The number of vehicles that will be affected by the incident(d) The average individual delay
Traffic flow on a three-lane (one direction) freeway can be described by the Greenshields model. One lane of the three lanes on a section of this freeway will have to be closed
to undertake an emergency bridge repair that is expected to take 2 hours. It is estimated that the capacity at the work zone will be reduced by 35 percent of that of the section
just upstream of the work zone. The mean free flow speed of the highway is 50 mi/h and the jam density is 115 veh/mi/In. If it is estimated that the demand flow on the
highway during the emergency repairs is 85 percent of the capacity, using the deterministic approach, determine the following.
(a) the maximum queue length (in veh) that will be formed
Your response differs from the correct answer by more than 10%. Double check your calculations. veh
(b) the total delay (in h)
h
(c) the number of vehicles that will be affected by the incident
veh
(d) the average individual delay (in min)
min
Chapter 6 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
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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