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As per IRC (Indian Roads Congress) recommendation, what will be the designed stopping sight distance (in meters) at the vehicle speed of 80 km/h on a rural highway?

As per IRC 73, safe stopping sight distance for a speed of 80 kmph is 120 m. (Calculated value is 118 m, rounded up value is 120 m).

Sight distance in the vertical curve is the length of the road ahead which is visible to the vehicle's driver.

Stopping sight distance

The length of the vertical curve should be sufficient to provide the sight distance. The stopping sight distance is the minimum length of the road that is required for stopping a vehicle. It is the total distance traveled by the vehicle during the following three time periods.

Stopping sight distance by IRC in rural highway

Speed (km/hr) Stopping site distance
20 20
30 30
40 45
50 60
60 80
80 120
100 180