Principles Of Highway Engineering And Traffic Analysis
7th Edition
ISBN: 9781119493969
Author: Mannering, Fred L., WASHBURN, Scott S.
Publisher: Wiley,
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Chapter 2, Problem 30P
To determine
The student's associated perception/reaction time.
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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)
A 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)?
A test of a driver's perception reaction time is being conducted a special testing track with wet pavement and a driving speed of 55 mi/hr. When the driver is sober, a stop can be made just in time to avoid hitting an object that is first visible 520 ft ahead. After a few drinks under exactly the same conditions, the driver fails to stop in time and strikes the object at a speed of 35 mi/hr. Determine the driver's perception/reaction time before and after drinking. (Assume practical stopping distance)
Chapter 2 Solutions
Principles Of Highway Engineering And Traffic Analysis
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- A child accidentally runs into the street in front of an approaching vehicle. The vehicle is traveling at 40 mi/h. Assuming the road is level, at what distance must the driver see the child to stop just in time?arrow_forward4. 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 it?arrow_forwardA driver takes 3.2 seconds to react to a situation complex while driving at 55 miles/hour. How far the vehicle goes before the driver initiates a physical response to the situation (i.e., applies the brakes)?arrow_forward
- A test of a driver’s perception/reaction time is being conducted on a special testing track with level, wet pavement and a driving speed of 50 mi/h. When the driver is sober, a stop can be made just in time to avoid hitting an object that is first visible 385 ft ahead. After a few drinks under exactly the same conditions, the driver fails to stop in time and strikes the object at a speed of 30 mi/h. Determine the driver’s perception/reaction time before and after drinking. [Assume Practical Stopping Distance].arrow_forwardAn engineering student is driving on a level roadway and sees a construction sign 600 feet ahead in the middle of the roadway. The student strikes the sign at 35 mph. If the student was travelling at 55 mph when the sign was first spotted, what was the student's associated perception-reaction time, in seconds? Assume that deceleration is 11.2 ft/s2A. 9.81B. 5.29C. 8.91D. 2.59arrow_forwardProblem: Tests reveal that a normal driver takes about 0.75 s before he or she can react to a situation to avoid a collision. It takes about 3 s for a driver having 0.1%% alcohol in his system to do the same Questions 1: if such drivers are traveling on a straight road at 30 mph (44 ft/s) and their cars can decelerate at 23 ft/s^2, determine the shortest stopping distance d for normal driver from the moment he or she see the pedestrians. Express your answer with the appropriate units. Question 2: Determine the shortest stopping distance d for drunk driver from the moment he or she see the pedestrians. Express your answer with the appropriate units. Please help me with both of these questions, make sure to show neat hand writing and explaintions. Thnak youarrow_forward
- Car 1 is at gasoline station for 10 minutes. The driver notices that car 2 passes at a speed of 40 mph. How long will it take for Car 1 to overtake Car 2 if it accelerated at 4 m/s?arrow_forwardYou are to determine the duration of the yellow light at a highway intersection. Assume that cars will be approaching the intersection traveling at 70 mph, and that the reaction time of the driver is 2.5 sec and that cars achieve a deceleration of 1/8 of the gravitational acceleration. if g=32.2 fps^2, a. how long must the traffic light remain yellow to allow drivers to come to stop before the traffic light turns red? b. what is the minimum distance of a car from the intersection when the lightturns yellow to ensure that it comes to a full stop before the intersection?arrow_forwardIn an intersection collision, one of the vehicles leave 165 ft of skid marks. A skid mark analysis indicates that the vehicle was traveling 54 mph at the onset of braking. Assuming the driver’s perception-reaction time is 1.25 seconds, estimate the distance from the point of impact to the vehicle position when the driver initially reacted.arrow_forward
- Problem: Car B is traveling a distance d ahead of car A. Both cars are traveling at 60 ft/s when the driver of B suddenly applies the brakes, causing his car to decelerate at 12 ft/s^2. It takes the driver of car A 0.75 s to react (this is the normal reaction time for drivers). When he applies his brakes, he decelerates at 20 ft/s^2. (Figure 1_ Question: Determine the minimum distance d between the cars so as to avoid a collision. Express your answer to three significant figures and include the appropriate units.arrow_forwardIn a stream of vehicles, 20% of the vehicles travel at a constant 50 km/hr, 30% at a constant speed of 80 km/hr and the remaining vehicles travel at a constant speed of 100 km/hr. An observer travelling at a constant speed of 60 km/hr over a length of 6 km with the stream is passed by 10 more vehicles than he passes. When the observer travels against the stream at the same speed and over the same length of highway, the number of vehicles met is 390. What is the mean speed and flow of traffic stream being observed? How many vehicles travelling at 100 km/hr are met by the observer while he travels against the stream?arrow_forwardA vehicle pulls out onto a single-lane highway that has a flow rate of 300 veh/h (Poisson distributed). The driver of the vehicle does not look for oncoming traffic. Road conditions and vehicle speeds on the highway are such that it takes 1.7 seconds for an oncoming vehicle to stop once the brakes are applied. Assuming a standard driver reaction time of 2.5 seconds, what is the probability that the vehicle pulling out will get in an accident with oncoming traffic?arrow_forward
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