The invention provides a blockage-free driving method which is a method for simplifying a traffic flow and performing passing through without crossing and waiting at crossroad. The conventional direct left turn is converted into right circling and a simple flyover is established, so that a straight driving traffic flow and a rightward driving traffic flow can smoothly pass through without crossing. With the adoption of a novel left turn manner, the simple flyover can express a great function, so that the blockage-free driving method is applied to solve a city traffic jam problem as a previous structure of a city does not need to be changed, and more safe and energy-saving and emission-reduction effects can be brought.