Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 6, Problem 18P
To determine
(a)
The maximum queue length that will be formed.
To determine
(b)
The total delay.
To determine
(c)
The number of vehicles that will be affected by the incident.
To determine
(d)
The average individual delay.
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5.2 Assume that you are an observer standing at a
point along a three-lane roadway. All vehicles in lane
1 are traveling at 30 mi/h, all vehicles in lane 2 are
traveling at 45 mi/h, and all vehicles in lane 3 are
traveling at 60 mi/h. There is also a constant spacing
of 0.5 mile between vehicles. If you collect spot speed
data for all vehicles as they cross your observation
point, for 30 minutes, what will be the time-mean
speed and space-mean speed for this traffic stream?
There are 20 cars traveling at constant speeds on a 1 mile long ring track and the cars can pass each
other freely. On the track 25% of the cars are traveling at 20 mph, 50% of the cars are traveling 10 mph,
and the remaining 25% of the cars are traveling at an unknown speed. It was known that the space mean
speed of all the cars on the track is 20 mph.
(a) What is the speed that the remaining 25% of cars are traveling at?
(b) If an observer standing on the side of the track counted the number and measured the speed of all
cars that passed her for one hour, what is the time-mean speed of all the cars the observer counted?
(c) What is the flow rate measured by the observer?
(d) What is the car density on the track? Does density times space mean speed equal flow rate?
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2.20 A driver is traveling at 90 mi/h down a 3%
grade on good, wet pavement. An accident
investigation team noted that braking skid marks
started 410 ft before a parked car was hit at an
estimated 45 mi/h. Ignoring air resistance, and using
theoretical stopping distance, what was the braking
efficiency of the car?
2.21 A small truck is to be driven down a 4% grade
at 70 mi/h. The coefficient of road adhesion is 0.95,
and it is known that the braking efficiency is 80%
when the truck is empty and decreases by one
percentage point for every 100 lb of cargo added.
Ignoring aerodynamic resistance, if the driver wants
the truck to be able to achieve a minimum
theoretical stopping distance of 275 ft from the
point of brake application, what is the maximum
amount of cargo (in pounds) that can be carried?
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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