Abstract: For the current problems of vehicle traffic jam , difficulty in parking, and heavy pollution emissions in cities, a narrow vehicle roll method suitable for urban traffic is proposed. The steering wheel angle information and vehicle speed information are obtained in real time while the vehicle is driving, and the required roll angle when the vehicle is stable is calculated and the roll is carried out while steering so as to prevent the vehicle from rollover in the process of steering. In this paper, an active roll vehicle using with a new roll mechanism is designed and the vehicle roll angle parameter and roll execution strategy are analyzed. The active roll can be realized through the roll mechanism. The prototype S-track and O-track steering tests are carried out on outdoor roads for verification. The test results show that the lateral acceleration of the active roll prototype can be reduced by 95% during the steering process, effectively preventing the rollover danger caused by the centrifugal force when the vehicle is turning, verifying the feasibility of the active roll method and active roll mechanism scheme

Key words: urban traffic, narrow vehicle, active roll, direct roll control