Stopping sight distance (SSD) on a road is the minimum distance required for a driver to:
Choose the correct answer
Overtake a slow vehicle safely
Stop a vehicle safely after seeing an obstruction on the road
Change lanes safely
Complete a U-turn
Correct Answer
B. Stop a vehicle safely after seeing an obstruction on the road
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SSD = reaction distance + braking distance = V x t_r + V^2/(2gf), where V = design speed, t_r = reaction time (2.5 s as per IRC), f = coefficient of longitudinal friction, g = 9.81 m/s2. SSD depends on design speed and grade.
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