Question

Design rate of superelevation for horizontal highway curve of radius 450 m for a mixed traffic condition, having a speed of 125 km/hour is

• A. $0.05$
• B. $0.154$
• C. $1.0$
• D. $0.07$

Answer 1

The correct option is D $0.07$

$e=\frac{V^2}{225R}=\frac{(125{)}^2}{225\times 450}=0.154$

But
$0.154>(e_{max}=0.07)$
Which is not OK
Hence design rate of superelevation is
$e=0.07$