PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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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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Chapter 2 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
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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- 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.arrow_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
- Problem 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_forwardA 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_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
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