Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 3, Problem 21P
To determine
The breaking distance to stop an average passenger car.
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Problem 23: A motorist traveling at 100 kph on an expressway intends to leave the expressway
using an exit ramp with a maximum speed of 50 kph. At what point on the expressway should the
motorist steps on her brakes in order to reduce her speed to the maximum allowable on the ramp
just before entering the ramp? The section of the expressway has a downgrade of 3%.
Acceleration is 3.5 m/sec?.
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.
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]
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Traffic and Highway Engineering
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- 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/secarrow_forwardA local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.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 local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight distance problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.arrow_forwardYou are designing an on-ramp that connects an intersection (controlled by a signal) and the highway. You want to assure that vehicles that are completely stopped at the intersection can reach the prevalent highway speed, which is assumed to be 60mph. Assume that passengers have the maximum acceleration rate of 10 ft/sec2 , trucks have smaller acceleration rate 3.2 ft/sec2 . You can assume that vehicles can use the maximum acceleration rate regardless of the speed. What’s the reasonable length for the ramp?arrow_forward
- An engineering student claims that a country road can be safely negotiated at 65 mi/h in rainy weather. Because of the winding nature of the road, one stretch of level pavement has a sight distance of only 510 ft. Assuming practical stopping distance, comment on the student.arrow_forwardWhat is the distance required to stop an average passenger car when brakes are applied on a 2% downgrade if that vehicle was originally traveling at 40 mi/h?arrow_forwardQUESTION 2 An intersection has a speed limit of 35 mph and the intersection is 33 ft wide. Our "design vehicle" is 20 ft long and can brake at 11.2 ft/sec2. If PIEV time is 1.4 seconds, what is the value of minimum safe clearance time (in seconds)?arrow_forward
- 2. A section of a roadway changes its speed from 65 mph to 45 mph due to start of a work zone. If the sign is visible from 70 ft away for a standard driver, how far away from the start of the work zone area should the sign be placed?arrow_forward3. 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.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_forward
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