PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Question
Chapter 2, Problem 33P
To determine
Theperception/reaction time of the driver before and after drinking assumingpractical stopping distance.
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A car is driving at 75 mph down a 4.0 % grade on poor, wet pavement. The car's braking efficiency is 90%. The driver
saw an object which is 480 ft away and applied the brake, and his reaction time was 1.0 second. The car's antilock
braking system (ABS) works. Just after seeing the object, which of the following is closest to the distance (in ft)
traveled before applying the brake?
(Assume theoretical stopping distance ignore air resistance and let yb= 1.04 and fr = 0.015).
153 ft
B) 127 ft
135 ft
A test driver’s perception-reaction time is being conducted on a special testing track with wet
pavement and a driving speed of 50 kph. When the driver is sober, a stop can be made just in time to
avoid hitting the object that is visible 40m. ahead. After a few drinks of San Miguel beer, under
exactly the same condition, the driver fails to stop in time and strikes the object at speed of 30 kph. Determine the driver’s perception-reaction time after he was drinking. Assume coefficient of friction
is 0.6
The length of a highway is 550 m when a head-on
vehicle collision occurred. Police reports show that
neither human error nor vehicle malfunction was the
cause of the collision. Check if the length of the highway
is sufficient for an overtaking maneuver.
Accident Report:
-Speed of Overtaking Car = 96 kph
-Speed of Overtaken Car= 88 kph
-Perception-reaction time 2.5 sec
-Average acceleration = 2.4 m/sec2
-Time of the passing vehicle occupying the left lane
(10.4 sec)
- Distance between the passing vehicle at the end of its
maneuver and the opposing vehicle= 84 m
Chapter 2 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10P
Ch. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Prob. 15PCh. 2 - Prob. 16PCh. 2 - Prob. 17PCh. 2 - Prob. 18PCh. 2 - Prob. 19PCh. 2 - Prob. 20PCh. 2 - Prob. 21PCh. 2 - Prob. 22PCh. 2 - Prob. 23PCh. 2 - Prob. 24PCh. 2 - Prob. 25PCh. 2 - Prob. 26PCh. 2 - Prob. 27PCh. 2 - Prob. 28PCh. 2 - Prob. 29PCh. 2 - Prob. 30PCh. 2 - Prob. 31PCh. 2 - Prob. 32PCh. 2 - Prob. 33PCh. 2 - Prob. 34PCh. 2 - Prob. 35PCh. 2 - Prob. 36PCh. 2 - Prob. 37PCh. 2 - Prob. 38PCh. 2 - Prob. 39PCh. 2 - Prob. 40P
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- 1. Maria was trying to test the braking ability of her car determined that she needed 5.64m more to stop her car when driving downhill on a road segment of 5% grade than when driving downhill at the same speed along another segment of 3% grade. Determine the speed at which the student conducted her test and the braking distance on the 5% grade if the student is travelling at the test speed in the uphill direction.arrow_forwardThe driver of a vehicle is following another vehicle in front of her on a two-lane highway at night. She keeps a clearance of one car length for every 4 mph of speed while she follows the lead car. However, while going downhill at 56 mph, the lead car crashes into the rear of an unlighted abandoned truck. At what speed will her car hit the wreckage? Assume a perception-reaction time is 2 seconds, a deceleration rate of 11.2 feet/sec2, the length of cars of 18 feet, and the road grade as 3%.arrow_forwardpart a, assuming decelerat on rate is unknown bu the friction factor=0.2. 2. A driver traveling down a 4% grade collides with a roadside object. The roadway has a posted speed limit is 60mph. The driver mentioned he strictly followed the speed limit. The accident investigation team indicates: braking skid marks started 300 ft before the struck object. a. If the friction factor was measured as 0.2, estimate the speed of the vehicle when it struck the object. b. Estimate the minimum required friction factor so the 300 ft skid marks can allow the driver to safely stop before he would strike the object.arrow_forward
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