What is banking on road ?

For the vehicle to go round the curved track at a reasonable speed without skidding, the greater centripetal force is managed for it by raising the outer edge of the track a little above the inner edge. It is called banking of circular tracks.
Kindly refer to the following link,
https://www.meritnation.com/cbse/class11-science/studymaterial/physics/physics-part-i/laws-of-motion/12_183_8479