Left-turn prohibition measures warrants at unsignalized intersections

In order to set left-turn prohibition measures rationally, left-turn prohibition measures installation warrants at unsignalized intersection are discussed. While the analyses on conflict characteristics generation mechanism and different detour types of left-turn traffic are also described in this paper. We define conflict points as the sum of the two convergent traffic volume and establish intersection conflict points calculation model before and after taking left-turn prohibition measures. Then the conflict points variation value is taken as left-turn prohibition evaluation standard. If the variation value decreases after setting left-turn prohibition measures, we believe the measure is feasible; Otherwise, it is not suitable. Then an example is presented as verification which showing good results. The research will provide a basis for the implementation of left-turn prohibition measures at unsignalized intersections and improve its traffic efficiency.