Stopping Or Non Passing Or Headlight Sight Distance - Civil Engineering

## Friday, 23 November 2018

### Stopping Or Non Passing Or Headlight Sight Distance

Stopping or non passing or head light sight distance is the distance required by a driver of a vehicle traveling at a given speed to bring his vehicle to a stop after an object of the road become visible.It is made of two components:
 Stopping Or Non Passing Or Head Light Sight Distance
i) The distance traveled during the total reaction time i.e. the lag distance.
Therefore ,Stopping sight distance(Non Passing Or Headlight Sight Distance) = Lag distance + Breaking distance(in m) = 0.278 Vt + V2/254f  .

When there is an ascending gradient (+ n %) or descending gradient (- n %),the above equation becomes :
Stopping Sight Distance(Non Passing Or Head Light Sight Distance) = 0.278 Vt + V2/254(f ± 0.01n) .

On roads with restricted width or on single lane roads when two way traffic movement is permitted then minimum stopping sight distance should be equal to the twice the stopping sight distance calculated above.