When the centripetal force is greater than the frictional force, skidding occurs.

If μ is the coefficient of friction between the road and tire. then the limiting friction (frictional force) is f = μR where normal reaction R = mg

**f = μ (mg)**

Thus for skidding,

**Centripetal force > Frictional force**

mv^{2}/r > μ (mg)

v^{2}/rg > μ

but, v^{2}/rg = tan θ

so, tan θ > μ

When the tangent of the angle of banking is greater than the coefficient of friction, skidding occurs.