PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 2, Problem 29P
To determine
To calculate:
The braking efficiency of car
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Two cars are traveling on level terrain at 60 mi/h on a road with a coefficient of adhesion of 0.8. The driver of car 1 has a 2.5-s perception/reaction time and the driver of car 2 has a 2.0-s perception/reaction time. Both cars are side by side and the drivers are able to stop their respective cars in the same amount of distance after first seeing a roadway obstacle (perception/reaction plus vehicle stopping distance). If the braking efficiency of car 2 is 0.75, determine the braking efficiency of car 1. (Assume minimum theoretical stopping distance and ignore aerodynamic resistance.)
2.32 A driver is traveling at 52 mi/h on a wet road. An
object is spotted on the road 415 ft ahead and the driver
is able to come to a stop just before hitting the object.
Assuming standard perception/reaction time and
practical stopping distance, determine the grade of the
road.
Two cars are traveling on level terrain at 72 mi/h on a road with a coefficient of adhesion of 0.85. The driver of car 1 has a 2.4-s
perception/reaction time and the driver of car 2 has a 2.2-s perception/reaction time. Both cars are traveling side by side and the drivers are
able to stop their respective cars in the same distance after first seeing a roadway obstacle (perception and reaction plus vehicle stopping
distance). If the braking efficiency of car 2 is 0.75, determine the braking efficiency of car 1 (in % with 2 decimals). (Assume minimum
theoretical stopping distance and ignore aerodynamic resistance.)
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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- 3.) Two cars are traveling side by side on level terrain at 100 km/h on a road with a coefficient of adhesion of 0.8. The driver of car 1 has a 2.5-s perception/reaction time and the driver of car 2 has a 2.1-s perception/reaction time. The drivers are able to stop their respective cars in the same distance after seeing a roadway obstacle. If the braking efficiency of car 2 is 0.78, determine the braking efficiency of car 1. (Assume minimum theoretical stopping distance.) Note: mass factor=1.04, gravitational acceleration=9.807 m/s?arrow_forwardOne vehicle is following another on a two lancs, two way highway at night, according to the rule of thumb which allow one car length of spacing per 10 km/hr of speed, if both vehicles are traveling of 100 km/hr and lead car crashes in to the rear of unlighted parked truck, at what speed will the rear vehicle hit the wreckage, assume the perception reaction time of 0.5 sec. and the coefficient of braking friction is 0.5 ,assume length of vehicle is 3.5 m.arrow_forwardTwo cars are traveling on level terrain at 64 mph on a road with a coefficient of adhesion of 0.8. The driver of car 1 has a 2s perception/reaction time and the driver of car 2 has a 1.6s perception reaction time. Both cars are travelling side by side and the drivers are able to stop their respective cars in the same distance after first seeing a roadway obstacle (perception/reaction plus vehicle stopping distance). If the braking efficiency of car 2 is 0.75, determine the braking efficiency of car 1.arrow_forward
- The design speed for a two-way traffic on a two way lane road is 50 kmph. What is the value of safe stopping sight distance, if co-efficient of friction is 0.37 and reaction time of driver as 2.5 sec?arrow_forwardFor a vehicle travelling at 85km/hr determine the stopping sight distance required by the driver to avoid a broken-down vehicle in the middle of the road assuming perception reaction time is 2secs and rate of deceleration is 0.25 times gravity.arrow_forwardA driver on a level two-lane highway observes a truck completely blocking the highway. The driver applied the brakes and utilized the maximum longitudinal friction of 0.45 between the wet pavement surfaces and tires. The vehicle stopped only 10 m from the truck. If the driver was driving at 100 km/h, how far was she from the truck when she first observed it (assume perception-reaction time is 1.5 seconds)? How far was she from the truck at the moment the brakes were appliedarrow_forward
- Sight Distance A driver is traveling at 55 mi/h on a wet road. An object is spotted on the road 450 ft ahead and the driver is able to come to a stop just before hitting the object. Assuming standard perception/reaction time, determine the grade of the road.arrow_forward1. A car is approachin an intersection with velocity 35 mph. When the car is at a distance of 200 ft from the intersection, the signal turned yellow. If the driver decides to break, will he be able to stop safely? The driver's reaction time is 1.5 s. Assume the road surface as leveled. The maximum braking effort is applied. Will your answer change, if the grade of the road surface is downhill 3%? A car is at a distance of 200 ft from an intersection stop line when the signal turned yellow. What should be the minimum speed of the car (miles/hour) if the driver decides to apply brake and is just able to stop at the line? Use reaction time of 1.5 s and the road surface has zero grade.arrow_forwardQ2/ driver moving at speed of 43.8 mi/h with average acceleration = 1.43 he decides to pass the car on the right lane , the initial time for maneuver = 4 sec and the time of the passing vehicle is traveling in left lane =10 sec . determine the required distance to pass the vehicle ?arrow_forward
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