Q.64 A motorist travelling at 100 km/h on a highway needs to take the next exit, which has a speed limit of 50 km/ h. The section of the roadway before the ramp entry has a downgrade of 3% and coefficient of friction (f) is 0.35. In order to enter the ramp at the maximum allowable speed limit, the braking distance (expressed in m) from the exit ramp is

Q.64 A motorist travelling at 100 km/h on a highway needs to take the next exit, which has a speed limit of 50 km/ h. The section of the roadway before the ramp entry has a downgrade of 3% and coefficient of friction (f) is 0.35. In order to enter the ramp at the maximum allowable speed limit, the braking distance (expressed in m) from the exit ramp is

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter7: Intersection Design

Section: Chapter Questions

Problem 11P

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A motorist travelling at 100 km/hr on a highway needs to take the next exit, which has a speed limit of 50 km/hr. The section of the roadway before the ramp entry has a downgrade of 3% and coefficient of friction (f) is 0.35. In order to enter the ramp at the maximum allowable speed limit, determine the braking distance (expressed in m) from the exit ramp.
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.
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.
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.
A truck traveling at 48 mi/h on a curve road with 470 ft radius ,the cross section area for the truck is 58 feet square and the weight is 12000 lb , the road is smooth pavement with 2% down grade . find the horsepower produced by the truck ? Please urgent... Thank you
A car is traveling at 76 mi/hr down a 3% grade on poor, wet pavement. The car's braking efficiency is 90%. The brakes were applied 320 ft before impacting an object. The car had an antilock braking system, but the system failed 200ft after the brakes had been applied (wheels locked). What speed was the car traveling at just before it impacted the object? (Assume theoretical stopping distance, ignore air resistance, and let Frl=0.015)
Car A experienced engine failure the moment it enters a 2-km highway that has a constant grade of 4 deg throughout its span (4 deg. inclination). Point C is the location where car A experienced failure. When car A is towed by the truck it gains an acceleration of 3 m/s^2, at the same instance, car B is passing the same highway with a constant velocity of 40 km/hr and is 100m away from point C (measured along the pavement). 4. Car A will eventually overtake car B. How much time (from the moment the two cars met) will elapse when car A be 50 m away (measured along the pavement) from car B? 5. Car A will eventually overtake car B. At an instance where car A is 50m ahead of car B (measured along the pavement), what is the velocity of car A? answer in km/hr. 6. Car A will eventually overtake car B. At an instance where car A is 50m ahead of car B (measured along the pavement), how far is car B from point C? answer in unit of meters
Car A experienced engine failure the moment it enters a 2-km highway that has a constant grade of 4 deg throughout its span (4 deg. inclination). Point C is the location where car A experienced failure. When car A is towed by the truck it gains an acceleration of 3 m/s^2, at the same instance, car B is passing the same highway with a constant velocity of 40 km/hr and is 100m away from point C (measured along the pavement). 1. At what time will car A overtake car B? answer in unit of seconds. 2. How far from point C (along the pavement) will the two cars meet? answer in unit of meters 3. What is the velocity of car A at the instance it overtakes car B? answer in unit of km/hr
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 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,
traffic engineering - Q / A freeway is being designed to carry a heavy volume of 5000 veh / h on a regular weekday in rolling terrain . If the PHF is 0.9 and the traffic consists of 90 % passenger cars and 10 % trucks , determine the number of 12 - ft lanes required in each direction if the highway is to operate at level of service C. The free - flow speed is 70 mi / h , there is no lateral obstruction , and interchanges are 3 mi apart .
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.