Multiple choice

The extra widening required for a two-lane national highway at a horizontal curve of 300 m radius, considering a wheel base of 8 m and a design speed of 100 kmph is

  1. 0.42 m

  2. 0.62 m

  3. 0.82 m

  4. 0.92 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Extra widening We = nl^2 / 2R + V / (9.5 * sqrt(R)). With n=2, l=8, R=300, V=100: We = (2 * 8^2) / (2 * 300) + 100 / (9.5 * sqrt(300)) = 128/600 + 100 / (9.5 * 17.32) = 0.213 + 0.607 = 0.82 m.

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