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
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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 road is being designed for a speed of 110 km/hron a horizontal curve with a super elevation of 8%.If the coefficient of side friction is 0.10, theminimum radius of the curve (in m) required forsafe vehicular movement is..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,
- What should be the maximum speed (mph) of a car traveling on a leveled (zero grade) road surface if the available stopping sight distance is 400 ft? Assume 1.5 s of reaction time and braking friction coefficient of 0.35.At 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?1. A curve has a super elevation of 15° with angle of friction 10°. What is the radius of the curve such that there will be no lateral pressure between the tires and the roadway at a maximum speed of 60mph? 2. A vehicle travels along a curve of radius 200 m banked at an angle of 15°. If the static coefficient of friction between the road and the tires is 0.25, determine the largest constant speed at which the vehicle will not be thrown outward the banked curve.
- 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.What is the safe maximum speed without tipping or skidding for a 13,200 N automobile running around a flat curve of 80 m radius? Its center of gravity is 0.60 m above the road surface and the wheel tread is 1.5 m, and f = 0.50.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 car hits a tree at an estimated speed of 35 mi/h on a 3% downgrade. If skid marks of 100 ft are observed on dry pavement (F = 0.45), followed by 250 ft (F = 0.20) on a grass-stabilized shoulder, estimate the initial speed of the vehicle just before the pavement skid was begun.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.A driver is traveling at 45 mi/h and has a perception-reaction time of 3 seconds. A deer is spotted at a distance of 380 ft ahead and the driver is able to come to a stop just before hitting the deer. Assuming practical stopping distance, what is the grade of the road in percent?