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 Headlight Sight Distance

Stopping or non-passing or headlight 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.
........Read more(Overtaking Zone)

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