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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The driver of a vehicle travelling at 80kph up a grade requires 9m less to stop after he
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If the coefficient of friction between the tires and pavement is 0.50, what is the percent
grade and what is the braking distance.
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
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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- 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 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_forward
- A 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_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_forwardA 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_forward
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