PPSC CE_TRANSPORTATION_QUIZ 1 (App update required to attempt this test)

On what factors does stopping sight distance depends?

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

Calculate the safe stopping sight distance (in m) for the descending gradient of 3% for a design speed of 80 km/h. Take coefficient of friction as 0.35 and total reaction time as 2 seconds.

Calculate the lag distance for a design speed of 65 km/hr assuming the coefficient of friction as 0.36 and total reaction time of driver as 2.5 seconds?

Assuming a longitudinal coefficient of friction to be 0.5, the resulting retardation of a vehicle being brought to stop is, nearly (only magnitude)

A valley curve is formed by a descending gradient of 1 in 30 meeting an ascending gradient of 1 in 20. Calculate the length of valley curve for comfort condition if design speed on the curve is 70 kmph. Assume coefficient of centrifugal acceleration to be 0.54 m/s³.