GATE (CE) 2022: HIGHWAY ENGINEERING

On what factors does stopping sight distance depends?

1. Speed of vehicle
2. longitudinal friction coefficient
3. braking efficiency
4. Reaction time

What is the rising gradient for a vehicle moving at a design of 60 km/h? Take the ratio of Lag distance to Braking distance as 1.3.

Considering two vehicles moving in opposite directions at speeds of 85kmph and 60 kmph on a road surface with skid resistance of 0.72 and braking efficiency of 55%, what will be the non- passing sight distance? Assume necessary data.

A rigid pavement slab having thickness 20 cm is subjected to wheel load 3500 kg. Calculate the wheel load stress at the corner region using Westergaard's steam equation.  Assume the radius of contact area to be 15 cm and take radius of relative stiffness as 55 cm.

For a 20 cm thick cement concrete pavement, analysis of stresses gave the following values.
Wheel load stress due to corner loading = 25 kg/cm²
Wheel load stress due to edge loading = 27 kg/cm²
Warping stress at corner region during winter = 7 kg/cm²
Warping stress at edge region during winter = 5 kg/cm²
Warping stress at corner region during summer = 10 kg/cm²
Warping stress at edge region during summer = 8 kg/cm²
Frictional stress at edge region during summer= 5 kg/cm²
Frictional stress during winter = 4 kg/cm²
The most critical stress value for this pavement is ________ kg/cm².