Section 185(b) in The Punjab Motor Vehicles Rules, 1989
(b)When two motor vehicles approach each other in opposite directions at a point where they cannot meet without danger of collusion, the vehicle proceeding down hill shall give way to the vehicle proceeding uphill and when such a meeting takes place in a dip or on level stretch of road, the vehicle on the inside of the road, that is, the side from which the hill side sloped upwards, shall give way;