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,

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 and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter15: Geometric Design Of Highway Facilities

Section: Chapter Questions

Problem 25P

See similar textbooks

Similar questions

A roadway is being designed for a speed of 60 mi/h. At one horizontal curve, it is known that the superelevation is 7.0% and the coefficient of side friction is 0.10. Determine the minimum radius of curve (measured up to the traveled path) that will provide for safe vehicle operation. Use g = 32.2 ft/sec2
Show complete solutionThe rated speed of a highway curve of 60-m radius is 45kph. If fk between the tires and the road surface is 0.5, find the maximum speed (in kph) at which a car can round the curve without skidding.
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?
The maximum allowable speed of a car that could travel a circular curve is 87 kph. If the impact factor is 0.20, determine the degree of the circular curve. Round off to two decimal places. Please correct answer
The radius of a highway curve is 120m, and has an angle of 9.31° from the horizontal. The center of gravity of the car is located 0.80m above the roadway and the distance between the two front wheels is 1.2m. If the car has a total weight of 15KN, a. Determine the normal acceleration and the velocity (in kph) of the car before overturning? b. Find the maximum velocity of the car could move along the curve so that there will be no outstanding pressure between the tires and the roadway. c. If the coefficient of kinetic friction is 0.60, what is the maximum velocity (in kph) of the car without sliding?
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.
A delivery truck passes thru the expressway exit ramps at a design velocity of 50 kph. connects with a local road to allow ram traffic to turn right without stopping at an acceleration of 1.57 m/sq.s. The turning roadway has stabilized shoulders on both sides and provides for a one-lane one-way operation with no provisions for a passing stalled vehicle. Super elevation on the turning roadway is 0.08. Determine the minimum radius of curvature for the ramp in meters.
The speed limit of a hi-way curve is 42 mph. If the curve has a radius of 600 ft, at what speed will skidding impend if the coefficient of friction between tires and roadway is 0.25?
An existing horizontal curve has a radius of 85 metres which restricts the maximum speed on this section to only 60% of the design speed of the highway. Highway officials want to improve the road to elimintare this bottleneck. Assume coefficient of side friction is 0.15 and rate of superelevation is 8%. Compute the existing speed, design speed and new radius of curvature.
A car is entering a curve of radius 190m with a velocity of 165kph. Determine the angle of banking of the track to prevent the 1435kg car from sliding down the track. The coefficient of friction between the tires and the track is 0.30.
A certain roadway designed to have a speed limit of 30mph. If the superelevation is 6 and the coefficient of side friction is 0.2, determine the minimum radius (ft) of the curve. Use exact solution (do not use the table). Round your answer to 3 decimal places.
A parabolic sag vertical curve is formed when a rural highway passes under a bridge joining a -6% grade to the horizontal grade. The vertical point of intersection of these two grades lies 3 feet below the curve. If the vertical clearance of the underpass is only 10 feet, what speed limit would you suggest should be imposed at this spot, considering a safe stopping sight distance? Use H=3.5 ft, β= 1.50; assume vehicle deceleration rate of 13.5 ft/s2 and driver’s perception-reaction time of 2.5 seconds.