The invention discloses a method for changing trends of vehicles on roads in a town. Most bridge building methods at crossroads are formed in a low and more convenient mode, and construction can alsobe implemented at an existing crossroad with a narrow road area. Construction of a planning mode of the roads in the town is implemented, the bridge building method can be referred according to topography and landform, the floor space of each existing crossroad does not increase, bridge building at the crossroad is low in construction cost, and certain benefits such as safety, convenience for travelling of people are brought. Construction for changing trend mode of vehicles on the original roads and the crossroads in the town, traffic lights and some signs, marking rules are implemented, timefor waiting for traffic lights can be reduced, traffic jams, traffic violations and traffic accidents are reduced, the traffic order and the traffic environment are improved, the going-through efficiency is improved, and the road traffic to convenience, order, safe and smooth of people travelling are ensured.