. A driver traveling at 60 mph rounds a curve on a level grade to see atruck overturned across a roadway at a distance of 400 ft. Is the vehicle able to avoid hittingthe truck? If not, how fast is the vehicle traveling when it strikes the truck? Assume typicalreaction time and rate of deceleration. (Be sure to consider if you should apply stopping sightdistance or decision sight distance.)

Step 1:The initial speed of the truck vi=60mph=360060×5280ft/s=88ft/sdistance of the truck…

Answered: . A driver traveling at 60 mph rounds a…

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter7: Intersection Design

Section: Chapter Questions

Problem 19P

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Problem 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.
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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.
1. 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.
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]
Problem 4 Two cars are approaching each other from the opposite direction. Both cars are traveling the same grade of 4%. The speed of the car ruhning uphill is 40mph and the other running at 60mph. If reaction time for both drivers is 3.5 sec and friction is 0.5, compute the maximum distance required to avoid collision.
The freeway speed for a 40 foot long vehicle that spends 1.5 seconds occupying a 6 foot radius, approximately circular loop is .... ...... 34.7 ft/sec 27ft /sec 22 ft/sec O 30 ft/sec
The driver must slow down from 70 miles/hour to 60 miles/hour to through sharp turns on country highways. Warning sign for turn visible clear for a distance of 100 feet. How far ahead of the turn the sign should be placed for ensure that the vehicle has sufficient distance to reduce speed with safe? Use standard reaction times and deceleration rates that are recommended by AASHTO for basic braking maneuvers.
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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.
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