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GATE Exam Questions - Engineering

Q1:

On sag (or valley) curves the available sight distance is determined based on :

A design speed

B height of obstacle

C height of driver eye

D night-time driving conditions

ANS:C - height of driver eye

Night-time driving condition is the correct answer as the headlight of the vehicle at night is blocked by the vertical curve of the sag curve so that's why a beam angle of 1 degree is provided to get the desired headlight sight distance.