Question

The super elevation for a plain and rolling terrain on a curved portion of highway of radius 400 m and design speed 90 kmph in mixed traffic condition is _____%

• A. 9
• B. 4
• C. 10
• D. 7

Answer 1

The correct option is D 7

For mixed traffic condition
$=\frac{V^2}{225R}(V=kmph)$
$e_{\text{design}}=\frac{{90}^2}{225\times 400}=0.09=9\%$
But
$e_{design}\ngtr e_{max}\left(7\%\right)$
$\therefore e_{max}=e_{\text{design}}=7\%$