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Highway Engineering - Engineering

Q1:

The desirable camber for straight cement concrete roads, is

A 1 in 33 to 1 in 25

B 1 in 40 to 1 in 33

C 1 in 150 to 1 in 140

D 1 in 160 to 1 in 140

E none of these.

ANS:D - 1 in 160 to 1 in 140

Nothing like Hill road, plane area, heavy rainfall, and low rainfall is provided here, then how does the answer come? Anyone, explain, please.