The 'stopping sight distance' (SSD) on a crest vertical curve ensures that:
Choose the correct answer
Vehicle can travel at maximum speed without braking
Driver can see and stop before reaching an obstacle on road — governs minimum crest curve length
Only pedestrians can cross safely at crest
The road has adequate drainage at summit
Correct Answer
B. Driver can see and stop before reaching an obstacle on road — governs minimum crest curve length
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SSD on crest: driver eye height 1.2 m, object height 0.15 m (hazard on road). Minimum length of crest curve Lmin = N×SSD²/(f1+f2) where N = algebraic difference in grades, f1=√(2×1.2), f2=√(2×0.15). For S<L: Lmin = NS²/9.6; for S>L: Lmin = 2S−9.6/N. Ensures driver can see hazard at SSD distance at top of curve.
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