The 'cross slope' provided on roads is to:
Choose the correct answer
Only for aesthetics of the road
Quick drainage of rainwater from road surface — prevents hydroplaning and water damage to pavement
Provide additional road width for trucks
Control vehicle speed on straight sections
Correct Answer
B. Quick drainage of rainwater from road surface — prevents hydroplaning and water damage to pavement
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Cross slope (camber): transverse slope on road surface (both sides from crown). Purpose: drain rainfall quickly from road surface → prevents water ponding → reduces: (1) Hydroplaning risk; (2) Water ingress into pavement; (3) Skidding. Values (IRC:73): bituminous roads 2.0–2.5%; concrete 1.5–2.0%; gravel 2.5–3.0%; earthen 3.0–4.0%. On superelevated curves: single-sided (no camber — cross slope = superelevation).
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