Stopping Sight Distance (SSD) on a highway is the sum of:
Choose the correct answer
Only braking distance
Lag distance (during reaction time) + braking distance
Overtaking distance + braking distance
Gap acceptance distance
Correct Answer
B. Lag distance (during reaction time) + braking distance
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SSD = lag distance + braking distance = V·t + V²/(2g·f) where V = speed (m/s), t = reaction time (2.5 s as per IRC), f = coefficient of longitudinal friction, g = 9.81. Or in km/h: SSD = 0.278Vt + V²/(254f). SSD is minimum sight distance to stop safely before obstacle.
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