In comparison with normal drivers, drivers under the effects of drugs or alcohol ... stopping .sight distance isually require more perception-reaction time and hence need the same .a shorter .b longer .c
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- 5. An engineering student is driving on a roadway with a -1% grade and sees a traffic barricade 600 ft ahead in the middle of the roadway. Despite his best effort to stop in time, the student strikes the sign at a speed of 40 mi/hr. If the student was traveling at 70 mi/hr when the sign was first spotted, what was the student's associated perception-reaction time (use practical stopping distance). 6. A driver is traveling at 62 mi/hr on a wet road. An object is spotted on the road 600 ft ahead and the driver is able to come to a complete stop just before hitting the object. Assuming perception-reaction time of 2.5 seconds and practical stopping distance, determine the grade of the road.3) A vehicle is moving at 50 mph and suddenly sees an object. It applies the brakes and slows down to a speed of 15 mph. Calculate the following: a. Distance the vehicle would move before driver activates the brakes. (Use design PIEV time of 2.5 seconds) b. distance the vehicle moved after application of brakes to drop to 15 mph speed (assume constant Ideceleration rate of 11.2 ft/sec²)The driver of a vehicle is following another vehicle in front of her on a two-lane highway at night. She keeps a clearance of one car length for every 4 mph of speed while she follows the lead car. However, while going downhill at 56 mph, the lead car crashes into the rear of an unlighted abandoned truck. At what speed will her car hit the wreckage? Assume a perception-reaction time is 2 seconds, a deceleration rate of 11.2 feet/sec2, the length of cars of 18 feet, and the road grade as 3%.
- 02)4nswer A or B A) The table below shows the No. of vehicle on a section of highway.... Time 730-740 740-7:50 7:50-8 00 8:00-8:10 8:10-8:20 8:20-8:30 Volume 150 200 300 200 150 100 Find: 1- the total hourly volume 2-PHF 3- flow rateThe acceleration-time (598 T vehicle relationship for a subjected to non-uniform odi 599 teildv dv - ibndt noini Where, v is the speed in m/sec, t is the 67 time in sec, a and ß are parameters, on hin and 2013101 acceleration is, = (α-Bv₁) e-Br orit zwollot m di to Lione Vo is the initial speed in m/sec. consillit 0.46 If the accelerating behaviour of a intends to vehicle, whose driver WHOS Sp overtake a slow-moving vehicle ahead, is described as opel ati of em Inlever) 4 XIM dv IMEANIE -= (a-Bv). dt noupozdua brs Considering 1 ST (8) dv and=1.3 m/s² at t = 3 sec, the dt bhokowi bw marve distance (in m) travelled by the vehicle a= 2 m/s², p=0.05 s¯¹ (1 in 35 sec is tevelbs1:16 vasured revealed toTwo cars are traveling on level terrain at 72 mi/h on a road with a coefficient of adhesion of 0.85. The driver of car 1 has a 2.4-s perception/reaction time and the driver of car 2 has a 2.2-s perception/reaction time. Both cars are traveling side by side and the drivers are able to stop their respective cars in the same distance after first seeing a roadway obstacle (perception and reaction plus vehicle stopping distance). If the braking efficiency of car 2 is 0.75, determine the braking efficiency of car 1 (in % with 2 decimals). (Assume minimum theoretical stopping distance and ignore aerodynamic resistance.)
- 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.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)URGENT Please answer this problem in 15 minutes, need a correct answer with complete solution. Subject is Highway Engineering. Box the final answer and do not shortcut your solution. I will give an upvote if it satisfies. Thank you! A vehicle is moving on a level road at an initial speed of 40 km/h and a final speed of 0 km/h. Considering that the road is wet, what will be its stopping distance having a perception-reaction time of 3.2 seconds?
- A driver with 20/20 vision traveling at 55 mph in the median lane desires to exit the freeway at the exit ramp. If 5-in. letters are used, what is the minimum distance the sign should be placed ahead of the ramp exit? (Some assumptions that would be helpful are perception-reaction time = 2 sec; exit speed = 30 mph; deceleration rate = 4.80 ft/s2 a driver with 20/20 vision can read a sign at 55 ft per inch of letter height.) Discuss your results.URGENT Please answer this problem in 15 minutes, need a correct answer with complete solution. Subject is Highway Engineering. Box the final answer and do not shortcut your solution. I will give an upvote if it satisfies. Thank you! A vehicle that is moving on a wet road that has difference in elevation of 3 m on both ends. Starting point is higher than the end point. The horizontal length of the road is 100 m ends at an initial speed of 50 km/h and is needed to stop. What is its braking distance?Consider two cars approaching from the opposite directions at 90 km/h and 60 km/h. If the reaction time is 2.5 s, coefficient of friction is 0.7 and brake efficiency is 50% in both the cases, the minimum sight distance required to avoid a head-on collision will be nearly?