非常规交叉口设计研究现状与展望

To promote the innovative application of unconventional arterial intersection design (UAID) in China, the U-turn, diverging diamond interchange, contraflow left-turn lane, tandem intersection, continuous flow intersection and parallel flow intersection were selected, the geometric layouts, signal phase sequence schemes and control strategies of various types of UAIDs were systematically sorted out. The research results of UAIDs in the recent decade were reviewed from the perspectives of theoretical research and traffic safety benefit. The application feasibilities of various types of UAIDs in China were discussed. Analysis result indicates that there are no difficulties in modelling and solving the signal timing of UAIDs, and most of the literatures adopt accurate algorithms. The benefit evaluation results of UAIDs are different according to the research objects and problems, but on the whole, the U-turn should not be set at the intersection with a high left turn proportion, the diverging diamond interchange is suitable for the freeway and expressway, the contraflow left-turn lane performs better at the intersection with a higher left turn proportion, the tandem intersection has the optimal benefit in the oversaturated state, and the continuous flow intersection and parallel flow intersection have better benefits under the symmetrical demand. In the aspect of traffic safety, setting up the U-turn and diverging diamond interchange can reduce the possibility of accident, but there is no unified conclusion for other types of UAIDs due to the lack of data or no data. Due to the difference between the operation rule of UAID and the driver's cognition, drivers will be confused in the early stage of opening up. It is effective to adopt measures such as the driver training, front vehicle prompt and traffic police on-site guidance. The combination of automatic driving technology and UAID is more hopeful to accelerate the application and promotion of UAID. On the whole, the U-turn, contraflow left-turn lane and tandem intersection have good application prospects in China, the applicability of diverging diamond interchange in China needs to be further discussed in combination with the domestic traffic situation. Due to the complex operation rules of continuous flow intersection and parallel flow intersection, it is necessary to carry on pilot operation first and then gradually popularize.