The minimum design speed adopted where hair-pin bends are provided at hill roads is _________.

Question

Question

This question was previously asked in

JKSSB JE CE 2021 Official Paper Shift 3 (Held on 28 Oct 2021)

Answer 1

Concept:

Design Speed:

It is defined as the maximum speed at which vehicles can continuously travel safely under favorable conditions is called design speed.
It may also be thought of as the maximum approximate speed that will be adopted by most drivers, Choice of design speed has to be made carefully, so as to match the terrain condition and also to be acceptable to most road users.
It is the basic parameter that determines all other geometric design features.

Design speeds for various classes of Roads are given below in the table:

Hairpin bends:

A hairpin bend is a sharp curve and it is located on a hillside having the minimum slope and maximum stability.
It must also be safe from the viewpoint of landslides and groundwater.
For reducing the construction problems and expensive protection works, the hairpin bends should be provided with long arms and farther spacing.
The minimum design speed adopted where hairpin bends are provided at hill roads is 20 Kmph.