Question

The extra widening required for a horizontal curve of radius 150 m and for vehicle having design speed of 80 kmph, length of wheel base as 6 m, width of pavement=7.5 m.

• A. 0.24 m
• B. 0.687 m
• C. 1.11 m
• D. 0.927 m

Answer 1

The correct option is D 0.927 m

Width of pavement is 7.5 m, so Number of lanes = n = 2
$\text{Extra widening required}=\frac{n{l}^2}{2R}+\frac{V}{9.5\sqrt{R}}$

$=\frac{2\times 6^2}{2\times 150}+\frac{80}{9.5\sqrt{150}}=0.927m$