Principles of Highway Engineering and Traffic Analysis
6th Edition
ISBN: 9781118879078
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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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?
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.)
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
Principles of Highway Engineering and Traffic Analysis
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
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- Two 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_forward2.32 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.arrow_forwardA driver travelling at 50 mph sees a wall at a certain distance ahead. The driver applies the brakes immediately (perception time is 2.5 seconds) and begins slowing the vehicle at 6 m/sec^2. If the distance from the stopping point to the wall is 12 m, how far was the car from the wall upon perception?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
- One vehicle is following another on a two-lane, two-way highway at night according to the safe-driving “rule-of-thumb” of one car length spacing for each 10 mph of speed. Both of you traveling at 70 mph when the lead vehicle crashes into an unlighted disable vehicle. Assuming that one car length is 20 feet, f=0.28 and PIEV time is 1.5 for you, will you hit the lead vehicle? If so at what speed will you be going?arrow_forwardA 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 ftarrow_forwardOne of the two motor vehicles is moving up the ramp at 90 km / h on a road with a slope of 3%, the other goes down the ramp at a speed of 20 km / h on the opposite lane. What should be the shortest distance for two vehicle drivers to see each other in order to prevent collision by braking? The reaction time is 2.0 seconds and the sliding friction coefficient is 0.25.arrow_forward
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