Two cars are approaching each other from the opposite direction. Both cars are traveling the same grade of 4%. The speed of the car running 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.
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- a truck was travelling uphill at 50kph. the brakes are suddenly applied and the truck stopped in a distance of 16.1m. if the coefficient of friction between the tires and the road surface is 0.4, what is the grade of the road?A driver (with a reaction time 0.60 sec) is driving down hill on a 5% grade at 60 km /hr .find minimum stopping sight distance required on highway section ?assume coefficient of friction =0.7 locked wheels?On the 6% graded section of a highway, designed with a velocity of 90 km/h, traffic flow is allowed discontinously due to maintenance and repair works. The drivers have to be warned while approaching this section. Find the distance that traffic signs have to be placed on each side of the working area.Given: Pavement sliding coefficient, f=0,45 detection-reaction time, tr=0,75 sn
- A car is entering a curve of radius 190m with a velocity of 165kph. Determine the angle of banking of the track to prevent the 1435kg car from sliding down the track. The coefficient of friction between the tires and the track is 0.30. Show complete solution and draw FBD.You are shown an accident scene with a vehicle and a tree on uphill grade of 3%. The vehicle was estimated to hit the tree at 120 km/hr. The average length of skid marks was 20 meters. You have found that a car traveling that section under similar weather conditions at 60 km/hr can stop in 60 m. What was its initial speed?A curving roadway has a curve with a radius of 580 m. The superelevation has been set at 0.05, angle of 65o and the coefficient of side friction is found to be 0.20. In addition, the traffic engineer has designed the speed as 100 km/hr.i. Explain whether this designed speed will provide a safe vehicle operation or not?ii. Find middle ordinate M,
- An existing vertical curve on a highway joins a +3.0% grade with a -3.0% grade. If the length of the curve is 250 ft, what is the maximum safe speed on this curve? What speed should be posted if 5 mph increments are used? Assume a = 11.2 ft/sec2, perception-reaction time t = 2.5 sec, and that S>L. Use g = 32.2 ft/sec2At what angle should a highway curve of 610-ft diameter be banked to accommodatecars travelling at 105 mph? The coefficient of friction between the tires and the road is0.55. What is the rated speed of the curve?The design speed of a multilane highway is 60 mi/h. What is the minimum stopping sight distance that should be provided on the road if (a) the road is level and (b) the road has a maximum grade of 4%? Assume the perception-reaction time = 2.5 sec.
- Plz, solve this problem. Transportation Engineering-2 A four-lane highway (2 lanes in each direction) with 3.65m lanes has a horizontal curve designed for a 380 m centerline radius, and a 110 km/hr design speed. The grade is level. Use a driver perception reaction time of 2.5 sec and a vehicle deceleration rate of 3.4 m/sec2. Determine the closest distance any roadside object may be placed to the centerline of the inside lane of the roadway.(note: Do not round any value. Use calculated values).- What are the major reasons for accidents at curved highway?9) The driver of an automobile moving with the velocity of 90 km/h on a 4% graded descendinghighway section decides to overtake the bus moving with a velocity of 70 km/h despite theapproaching truck with a velocity of 50 km/h on the opposite direction.a) What should be the minimum distance between the automobile and the truck at thebeginning of the overtaking for safe manouevre ?b) If the truck has to stop op the highway, what is the upper and the lower limit of the tractionforce that must be diverted to its wheels in order to restart moving ?Given: di=8+0,2.Vi; pavement sliding coefficient, f=0,40; t = 0,020; the mass of the truck = 12ton, Qm=2/3.Q