Objective Question & Answer

For Roads (Highways): The maximum allowable value is taken as 1/4 (or 0.25). This aligns with

the typical limiting value of the side friction factor that prevents a road vehicle from skidding

laterally.

For Railways: The maximum value is more strictly limited to 1/8 or 0.125). This lower limit is

necessary because of the rigid nature of steel wheels on rails and the high demand for

passenger comfort inside trains.