What is the over turning of vehicle in circular track?

Over turning of a vehicle in circular path is that the vehicle seeks towards the center(turning towards center) instead of its original path. The condition for overturning is given by

v^2 > g*a*R/h

where v is the vehicle speed,g is the acc. due to gravity, a is the distance between the CG and the front axle, R is the radius of the circular path(road,track), h is the height of CG from the road level.

If the condition is true then overturning occurs.