Highway Enginee...

The sight distance available on a road to a driver at any instance depends on

1. Features of the road ahead

2. Height of the driver’s eye above the road surface

The extra widening required for a four-lane national highway at a horizontal curve of 800 m radius, considering a wheel base of 8 m and a design speed of 120 kmph is

Transition curve is provided on both ends of a circular curve having radius of 240 m. If the length of transition curve calculated on the basis of the allowable rate of centrifugal acceleration, by the allowable rate of introduction of superelevation(e) and minimum length as per IRC is computed as 50 m, 45 m and 48 m respectively, then the shift of the transition curve will be:

A vehicle, moving with a speed of 36 km/hr on a highway, suddenly applies brake and comes to stop after going for 14 m on the road. Theoretically for the ideal application of brakes, the friction coefficient that should be developed is 0.45. Then what is braking efficiency (in percentage correct up to one decimal point) of the vehicle? Take g = 10 m/s²

The radius of a horizontal circular curve is 480 m and design speed therein 70 kmph. What will be the equilibrium superelevation for the pressure on the inner and the outer wheels to be equal?

A four-lane national highway project of 100 km to be constructed, encounters an obstruction because of existence of a big circular play ground in between the projected highway. The highway is then planned to provide a horizontal curve of radius 350 m with stopping sight distance of 122 m. If the minimum length of the horizontal curve to be provided is 300 m, then the setback distance required from the centre line of the curve is (neglect extra widening)

A vehicle is travelling with the design speed of 75 km/hr on a highway located in a hilly terrain. What will be the length of transition curve (in meter corrected up to 2 decimal points) needed on a horizontal curve having radius of 200 m. The width of the road after inclusion of the required widening is found out to be 7.75 m. Assume, the pavement is rotated about the centre line while providing the required super-elevation. 

What is the head on collision distance (in meter corrected up to 2 decimal points) for a single lane two-way road on a stretch where a 3% upward gradient is provided? The design speed for the road is 60 km/hr, braking efficiency is 60% and coefficient of friction is 0.36. Take, acceleration due to gravity, g = 9.81 m/s².

A team of highway engineers are tasked to design a valley curve for a design speed of 70 km/hr on a highway where a descending gradient of 1 in 45 meets an ascending gradient of 1 in 65. The team has concluded to provide the valley curve in form of a cubic parabola and on the sole basis of comfort criteria. Then what will be the horizontal distance (in meter corrected up to 1 decimal point) of lowest point on the valley curve measured of the first tangent point? Take rate of change in centrifugal acceleration as 0.6 m/sec³.