Question

A super- elevation e is provided on a circular horizontal curve such that a vehicle can be stopped on the curve without sliding. Assuming a design speed v and maximum coefficient of side friction $f_{max}$, which one of the following criteria should be satisfied ?

• A. $e\le f_{max}$
• B. $e>f_{max}$
• C. $e=\frac{1-(f_{max}{)}^2}{f_{max}}$
• D. no limit on e can be set

Answer 1

The correct option is A $e\le f_{max}$

Sliding occurs if
$f<e$
and
$f<\frac{v^2}{gR}$

Overturning occurs if
$f>e$
and
$e<\frac{v^2}{gR}$

Hence, option (a) is correct.