Managing mixed traffic flow for improving safety and efficiency

针对摩托车与客车汽车相互混合的交通流，建立了混合交通流的安全性和效率性指标。在此基础上，分析了影响安全和效率的因素。结果表明，在空间上将摩托车与客车汽车分开，可以有效地提高混合交通流的安全性。从效率上看，在道路基础设施不完善、交通较为混乱的发展中国家，通过设置摩托车专用道的方式实现摩托车与乘汽车的空间隔离是有效的，而在发达国家，空间隔离政策的优势有限。相反，它揭示了时间隔离政策，即通过改变信号交叉口绿色灯的时间来暂时将摩托车与乘用汽车隔离，可能更有效。

Focusing on the traffic flow where motorcycles and passenger cars are mutually mixed, this study developed the indices for the safety and efficiency of the mixed traffic flow. Based on the indices, the influential factors on safety and efficiency was analyzed. As a result, it was revealed that segregating motorcycles from passenger cars spatially might be effective to improve the safety of the mixed traffic flow. In terms of the efficiency, it was effective to segregate motorcycles from passenger cars by making the motorcycles exclusive lane in developing countries where road infrastructure was not in good condition and traffic was rather chaotic, while in developed countries the advantage of the space segregation policy was limited. Rather, it was revealed that the time segregation policy, where motorcycles were temporally segregated from passenger cars by varying the timing of green light at signalized intersections, could be more efficient.