Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 2, Problem 29P
To determine
To calculate:
The braking efficiency of car
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One 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.
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.)
The distance traversed during perception-reaction time is equal to 10 meters if the speed of the car is 10 meters per second, and the perception-reaction time of the driver is 1 second. TRUE OR FALSE
Chapter 2 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
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- A 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_forwardA 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 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_forwardA driver is traveling at 80 kph on a wet road. An object is spotted on the road 125 m 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_forwardA vehicle moving at a speed at a speed of 90 kph along an incline surface having aslope of 5%. If the coefficient of friction is 0.20, determine the braking distance.arrow_forward
- If the vehicle is of 3 m long and moves at a speed of 80km/hr and the perception-reaction time is taken as 2.5 seconds. Take coefficient of friction as 0.36 (i) What will be the spacing to the front vehicle. (ii) Calculate the perception - reaction distance of the driver of the moving vehicle (iii) Estimate the trafic capacity of the roadarrow_forwardThe driver of a car travelling at a certain speed suddenly sees an obstruction ahead and travelled a distance of 55.8 m during the perception time of 1.45 sec. Determine the car's speed of approach in kph.arrow_forwardA driver on a level two-lane highway observes a truck completely blocking the highway. The driver was able to stop her vehicle only 10 ft from the truck. If the driver was driving at 70 mi/h, how far was she from the truck when she first observed it (assume perception-reaction time is 2.0 seconds)? How far was she from the truck at the moment the brakes were applied (use a/g=0.35)?arrow_forward
- A car is traveling at a speed of 100 ft/s which accelerates 12 ft/s2. The perception reaction time for the driver is 2.40 s. If the maximum grade of the road is -3.7%, compute the following: a. Braking distance in meters b. Lag distance in metersarrow_forwardA driver with a reaction time of 2.0 second is driving downhill on a 2% grade when suddenly a cat steps from behind a parked car in the path of the driver at a distance of 32m. In which scenario can the driver stop the car in time?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_forward
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