Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 3, Problem 22P
To determine
The distance between the truck and the driver when the brakes were applied.
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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.
One vehicle is following another on a two-lane, two-way highway at night according to the safe-driving “rule-of-thumb” of one car length spacing for each 10 mph of speed. Both of you traveling at 70 mph when the lead vehicle crashes into an unlighted disable vehicle. Assuming that one car length is 20 feet, f=0.28 and PIEV time is 1.5 for you, will you hit the lead vehicle? If so at what speed will you be going?
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Car A is traveling at a location where the speed limit is 100 km/h. The police officer in car Pobserves this speed via radar. The driver of
car Ais traveling at va - 136 km/h as it passes P, but over the next 5.5 seconds, the car uniformly decelerates to the speed limit of 100
km/h, and after that the speed limit is maintained. At the moment when A passes P, the police car begins to accelerate at the canstant
rate of 5.3 m/s? until a speed of 151 km/h is achieved, and that speed is then maintained. Determine the distance s required for the
police officer to overtake car A.
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Traffic and Highway Engineering
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- A driver on a level two-lane highway observes a truck completely blocking the highway. The driver was able to stop her vehicle only 20 ft from the truck. If the driver was driving at 60 mi/h, how far was she from the truck when she first observed.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_forwardQ2/ One vehicle is following another on a two lanes, two way highway at night, according to the rule of thumb which allow one car length of spacing per 10 km/hr of speed, if both vehicles are traveling of 100 km/hr and lead car crashes in to the rear of unlighted parked truck, at what speed will the rear vehicle hit the wreckage, assume the perception reaction time of 0.5 sec. and the coefficient of braking friction is 0.5 ,assume length of vehicle is 3.5 m.arrow_forward
- driver to safely stop before he would strike the object. 3. Refer to the following illustration; veh#2 is driving with the speed of 60mph, following veh#1 whose speed is 50mph. The lead car suddenly breaks to a stop within a 278 ft distance. Assume the friction factor is unknown, but both cars operate with the same deceleration rate, and veh#2 has a default reaction-perception time by AASHTO. If the roadway is level, estimate the minimum distance between the two cars so the collision can be prevented. 60 mph 50 mph 2 Sf stop 1 12×1) 278 ftarrow_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_forwardA car is driving at 75 mph down a 4.0 % grade on poor, wet pavement. The car's braking efficiency is 90%. The driver saw an object which is 480 ft away and applied the brake, and his reaction time was 1.0 second. The car's antilock braking system (ABS) works. Just after seeing the object, which of the following is closest to the distance (in ft) traveled before applying the brake? (Assume theoretical stopping distance ignore air resistance and let yb= 1.04 and fr = 0.015). 153 ft B) 127 ft 135 ftarrow_forward
- A 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_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_forward1. One driver is driving on a 3% upgrade roadway with an initial speed of 80 mph, assuming his perception-reaction time is 2 seconds, do the following: a. If the driver has to slow down to 0 mph to completely stop in front of an intersection. A stop warning sign for the intersection is clearly visible for a distance of 100 ft. How far in advance of the intersection must the sign be posted in order to insure that vehicles can safely stop, using deceleration rate=9 ft/sec²? b. Redo part a with the default deceleration rate. C. Redo part a, assuming deceleration rate is unknown but the friction factor=0.2.arrow_forward
- The length of a highway is 550 m when a head-on vehicle collision occurred. Police reports show that neither human error nor vehicle malfunction was the cause of the collision. Check if the length of the highway is sufficient for an overtaking maneuver. *Accident Report: Speed of Overtaking Car = 96 kph, Speed of Overtaken Car = 88 kph, Perception-reaction Time = 2.5 sec, Average acceleration = 2.4 m/sec2, Time of the passing vehicle occupying the left lane = 10.4 sec, Distance between the passing vehicle at the end of its maneuver and the opposing vehicle = 84m.arrow_forwardA 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_forward2.30 An engineering student is driving on a level roadway and sees a construction sign 500 ft ahead in the middle of the roadway. The student strikes the sign at a speed of 25 mi/h. If the student was traveling at 55 mi/h when the sign was first spotted, what was the student's associated perception/reaction time (use practical stopping distance)?arrow_forward
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