EBK PRINCIPLES OF HIGHWAY ENGINEERING A
6th Edition
ISBN: 9781119299332
Author: WASHBURN
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 2, Problem 31P
To determine
Whether the student's claim that a country road can be safely negotiated at
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The rated speed of a highway curve of 60 m radius is 50 kph. If the coefficient of friction between the tires and the road is 0.25, (a) What is the minimum speed at which a car can round the curve without skidding? (b) What is the frictional force exerted on the wheels of the car when the speed observed is 35 kph? 1kph= 0.28 mps
An existing horizontal curve has a radius of 85 meters, which restricts the
maximum speed on this section of road to only 60% of the design speed of the
highway. Highway officials want to improve the road to eliminate this bottleneck.
Assume coefficient of side friction is 0.15 and rate of superelevation is 0.08.
Compute the existing speed, design speed, and find the new radius of curvature.
A car hits a tree at an estimated speed of 32 mph on a 3% downgrade. If skid marks are observed for a distance of 130 feet on a dry pavement (a= 15.5 feet/sec2), followed by 210 feet on a grass-stabilized shoulder (a= 7.6 feet/sec2), estimate the initial speed of the vehicle.
Chapter 2 Solutions
EBK PRINCIPLES OF HIGHWAY ENGINEERING A
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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- Highway curve with a radius of 300m is to be super elevated to accomodate a normal speed of 72 kph. Calculate the required super elevation e if the width b of the pavement is 10marrow_forwardWhat is the safe stopping distance for a section of rural freeway with a design speed of 80 mi/h and maximum coefficient of skidding (forward) friction on: a) Level terrain b) 4% upgradearrow_forwardA new transportation engineer is charged with the design of a horizontal curve a certain highway. His final design calls for a curve with a radius of 520 meters. Assume that the design speed for the highway is 110 km/h. Is the design curve acceptable? Consider super elevation of 8% and a maximum side friction factor of 0.1.arrow_forward
- A vehicle weighing 2000-lb is traveling 30 mph at 5% upgrade with rate of 6 ft/sec². The vehicle has a frontal cross-section area of 20 ft. The roadway has horizontal alignment, and a badly broken and patched asphalt surface. Assume the drag coefficient = 0.3, air density = 0.076 lb/ft³. Find the curve resistance if the horsepower required to accelerate the vehicle is 100 hp.arrow_forwardProblem 2. A car hits a tree at an estimated speed of 25 mph on a 3 % upgrade. If skid marks of 120 ft are observed on dry pavement (coefficient of braking friction, fb =0.35) followed by 250 ft (fb =0.25) on a grass stabilized shoulder, estimate the initial speed of the vehicle just before the pavement skid began.arrow_forwardThe car's braking distance from a velocity of v= 96 km/hr is 45 m on a level pavement. Assuming that the braking force is independent of the grade of the pavement, determine the car's braking distance from the same velocity when it is (a) Going up a 10-percent incline (b) Going down an 8° inclinearrow_forward
- A 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. Calculate the total stopping sight distance for a wet pavement condition, if the design speed is 100 Km/hr for the following three conditions. a. Road is flat b. The road has a 6% downslope c. The road has a 3% upslopearrow_forwardSubject : Transportation engineering Read the question carefully and give me right answer according to the options. what is the desirable superelevation that should be applied to a curve radius 124m, for a posted speed of 50km/h. Assume that this is a two-lane rural road that will be used by cars and trucks. a) 6.0% b) 5.8% c) 7.0% d)5.5%arrow_forward
- A divided multilane highway in a recreational area has four lanes (two lanes in each direction) and is on rolling terrain. The highway has 10-ft lanes with a 6-ft right-side shoulder and a 3-ft left-side shoulder. The posted speed is 50 mi/h. Previously, there were 4 access points per mile, but recent development has increased the number of access points to 12 per mile. Before development, the peak-hour factor was 0.95, and the directional hourly volume was 2200 vehicles with 13% heavy vehicles. After development, the directional hourly volume is 2600 vehicles with the same vehicle percentages and peak-hour factor. What is the LOS before and after the development?arrow_forwardA 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.arrow_forwardA 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,arrow_forward
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