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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Question
Chapter 2, Problem 27P
To determine
The minimum distance from the stalled car at which the driver could apply the brakes and still stop before hitting it.
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a truck was travelling uphill at 50kph. the brakes are suddenly applied and the truck stopped in a distance of 16.1m. if the coefficient of friction between the tires and the road surface is 0.4, what is the grade of the road?
A 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.
1. A driver is travelling at 50 mph is 80 m from a wall ahead, if the driver applies the brake immediately at t=2 secs, and begins slowing down at 10m/s^2.a. Find the distance from the stopping point to the wall.b. Determine the braking time or the time during deceleration.c. Determine the average skid resistance, assuming brake efficiency of 70%.
2. A two lane road with design speed of 80 kph has horizontal curve of radius 480 m. Design the rate of superelevation. By how much should the outer edges of the pavement be raised with respect to the center line, if the pavement is rotated with respect to the center line and the width of the pavement at the horizontal curve is 7.5 m?
Chapter 2 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
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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- An automobile’s braking distance from 108 km/h is 75 m on level pavement. Assume the braking force is independent of grade. Determine the automobile’s braking distance from 108 km/h when it is going up a 5° incline. The automobile’s braking distance from 108 km/h when it is going up a 5° incline is _____m.arrow_forward43. A truck was travelling uphill at 50 kph. The brakes are suddenly applied and the truck stopped in a distance of 16.1 m. If the coefficient of friction between the tires and the road surface is 0.4, what is the grade of the road?arrow_forwardA car is traveling at 76 mi/hr down a 3% grade on poor, wet pavement. The car's braking efficiency is 90%. The brakes were applied 320 ft before impacting an object. The car had an antilock braking system, but the system failed 200ft after the brakes had been applied (wheels locked). What speed was the car traveling at just before it impacted the object? (Assume theoretical stopping distance, ignore air resistance, and let Frl=0.015)arrow_forward
- A truck travels along a straight, level road at the speed of 76ft/sec. when the driver is forced to apply the breaks to avoid an accident. If the truck undergoes a constant deceleration of 6ft/sec2, how far does the truck travel before coming to a complete stop?arrow_forwardA driver is driving at 75 kph when a dog suddenly appeared and stopped at the middle of the road. Determine the distance the vehicle would move before the driver could activate the brakes. Assume PRT is 2.50 secs. If the friction factor is 0.30 and brake efficiency is 45%, determine the braking distance. If the vehicle is 250 m away when the driver sees the dog, will the dog be hit by the vehicle?arrow_forwardA car is to be driven up a 7° incline road. Determine the automobiles braking distance from 30 m/s if the brakingdistance at 25 m/s speed is 45m when applied on a horizontal plane. Determine the braking distance going down a 5% incline. Assume the braking force is independent of the slope.arrow_forward
- A car is traveling up a 3% grade, with the speed of 85mph, on a road that has good, wet pavement. A deer jumps out onto the road and the driver applies the brakes 290-ft from it. The driver hits the deer at a speed of 20mph.If the driver did not have antilock brakes, and the wheels were locked the entire distance, would a deer-impact speed of 20mph be possible? (Hint: check the braking efficiency) [Use Theoretical Stopping Distance]arrow_forwardWhat is the safe maximum speed without tipping or skidding for a 13,200 N automobile running around a flat curve of 80 m radius? Its center of gravity is 0.60 m above the road surface and the wheel tread is 1.5 m, and f = 0.50.arrow_forwardWhat should be the maximum speed (mph) of a car traveling on a leveled (zero grade) road surface if the available stopping sight distance is 400 ft? Assume 1.5 s of reaction time and braking friction coefficient of 0.35.arrow_forward
- A car having a weight of 40 kN is moving at a certain speed around the curve. Assuming no lateral pressure between the tire and the pavement, compute for the following if the centrifugal ratio is 0.30. (a) Compute the force that will tend to pull the car away from the center of the curve. (b) If the degree of the curve is 4 degrees, determine the maximum speed that the car could move around the curve. (c) Compute for the embankment angle to be provided for this speed if the skid resistance is 0.12.arrow_forwardA driver is traveling at 45 mi/h and has a perception-reaction time of 3 seconds. A deer is spotted at a distance of 380 ft ahead and the driver is able to come to a stop just before hitting the deer. Assuming practical stopping distance, what is the grade of the road in percent?arrow_forwardThe rated speed of a highway curve of 200 ft radius is 40 mph. If the coefficient of friction between the tires and the road is 0.26, (a) What is the maximum speed at which a car can round the curve without skidding?arrow_forward
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