Stopping Sight Distance

The minimum sight distance offered on a road at any spot ought to be of enough length to prevent a vehicle from traveling at style speed, safely while not a collision with the other obstruction. absolutely the minimum sight distance is adequate for the stopping sight distance, which is additionally sometimes referred to as non-passing sight distance.

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

(i) features of the road ahead.

(ii) height of the driver‘s eye above the road surface.

(iii) height of the object above the road surface.

The feature of the road ahead which affect the sight distance is the horizontal alignment and vertical profile of the road, the traffic condition, and the position of obstructions. At vertical summit curves, the height of the driver‘s eye and the object above road level are more important factors affecting visibility. The height of an object to be considered for stopping a vehicle depends on what might be a source of danger to the moving vehicle. For the aim of mensuration the stopping sight distance or visibility ahead. IRC has suggested the height of the eye level of the driver as 1.2 m and the height f the object as 0.15 m above the road surface.

Hence the stopping distance available at a summit curve is the distance measured along the road surface at which an object of height 0.15 m can be seen by a driver where the eye is at a height of 1.2 m above the road surface fig

The distance within which a motor vehicle can be stopped depends upon the factors listed below:

(a) The total reaction time of the driver

(b) Speed of vehicle

(d) Frictional resistance between the road and the types

(e) The gradient of the road.

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