EBK PRINCIPLES OF HIGHWAY ENGINEERING A
6th Edition
ISBN: 9781119299332
Author: WASHBURN
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 2, Problem 32P
To determine
To calculate:
The grade of road by considering standard perception/reaction time and practical stopping distance
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3. Drivers must slow from 70 mph to 40 mph to negotiate a severe curve on a rural
highway. A warning sign for the curve is visible for 100 ft. How far in advance of
the curve is it necessary to post the sign to insure that vehicles are able to properly
decelerate? Assume f-0.30, G=0.0% and perception reaction time is 2 sec.
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.
The design speed of a multilane highway is 60 mi/h. What is the minimum stopping sight distance that should be provided on the road if (a) the road is level and (b) the road has a maximum grade of 4%? Assume the perception-reaction time = 2.5 sec.
Chapter 2 Solutions
EBK PRINCIPLES OF HIGHWAY ENGINEERING A
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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- A driver travelling at 50mph sees a hazard (boulder) at a certain distance ahead. The driver then applies the brakes immediately (PIEV) time is 2 seconds and begins slowing the vehicle at 10m/sec? (decelerating). If the distance from the stopping point to avoid hitting the boulder is 10.28m, how far was the car from the boulder upon perception?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_forwardA car is approaching toward an intersection with speed 45 mph. The road has a downhill grade of 1%. When the car is at a distance of 250 ft from the intersection, the signal turned yellow. If the driver applies brake and the reaction time of the driver is 1.5 s, will the driver be able to come to a complete stop? Justify your answer with calculations. Assume braking friction coefficient of 0.35.arrow_forward
- What distance will a vehicle travel before coming to a complete stop from a speed of 70 mph, (a) When the vehicle is traveling on a level roadway with no grade, (b-1) When the vehicle is traveling uphill on a roadway of constant grade = 0.10, (b-2) If the roadway grade is not constant but starts at 0.10 uphill and decreases to 0 at a continuous rate, would the braking distance be equal to, greater than, or less than that in the case of a constant 0.10 uphill grade (briefly explain why) (c) When the vehicle is traveling downhill on a roadway of constant grade = 0.10. Assume a perception-reaction time of 2.5 seconds, and an a/g value equal to 0.35.arrow_forwardA driver driving at 69 kph at a straight flat portion of the highway suddenly encounters an obstruction. He applies his brakes. If the coefficient of friction of the roadway to the tires is equal to 0.5, calculate the maximum safe distance (rounded to the nearest meters) the driver can apply his brakes to avoid collision.arrow_forwardA driver traveling at 50 mph sees a wall at a certain distance ahead. The driver applies the brakes immediately upon perception and begins slowing down at 6 m/s. If the distance from the stopping point to the wall is 12m, how far was the car from the wall upon perception if reaction time is 3 sec.? what is the coefficient of friction?arrow_forward
- A driver (with a reaction time 0.60 sec) is driving down hill on a 5% grade at 60 km /hr .find minimum stopping sight distance required on highway section ?assume coefficient of friction =0.7 locked wheels?arrow_forwardProblem 3. Drivers must slow down from 60 mph to 40 mph to negotiate a severe curve on a rural highway. A warning sign is determined to be visible from 120 ft. away. How far must the sign be located, in advance of the curve, to ensure that vehicles have sufficient distance to decelerate? Use the standard reaction time and deceleration rate recommended by AASHTO for basic braking maneuvers.arrow_forwardA driver of a car applied the brakes and barely avoided hitting an obstacle on the roadway. The vehicle left skid marks of 26 m. (Assume f-0.6) determine whether the driver was in violation of the 70 km/hr speed limit at the location if he was travelling : a/ uphill on a 3° incline or, b/ downhill on a 3º incline.arrow_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 travelling at 50mph sees a hazard at a certain distance ahead. The driver then applies the brakes immediately, time is 2sec and begins slowing the vehicle at 10m/s^2. If the distance from the stopping point to avoid hitting the boulder is 10.28m, how far the car from the hazard upon perception.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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