Multiple choice

A rest vertical curve joins two gradients of +3% and -2% for a design speed of 80 km/h and the corresponding stopping sight distance of 120 m. The height of driver’s eye and the object above the road surface are 1.20 m and 0.15 m respectively. The curve length (which is less than stopping sight distance) to be provided is

  1. 120 m

  2. 152 m

  3. 163 m

  4. 240 m
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For a vertical curve where L < SSD, the formula is L = 2S - (2*sqrt(h1) + 2*sqrt(h2))^2 / A. With A = 0.03 - (-0.02) = 0.05, S = 120, h1 = 1.2, h2 = 0.15, the calculation results in 152 m.

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