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Distant lead is one of the ways to eliminate the left turn of the intersection, and the determination of the length of the U-turn is the key to determining the success of the method. For the determination of the optimal length of the far-lead turn-around, the main traffic parameters are determined on the basis of the existing statistic data, and then the VISSIM is used to analyze the intersection in peak period and no-peak period. Finally, the simulation results are statistically analyzed by MATLAB, and the shortest distance of the simulation travel time is taken as the optimal lead length. The results show that the optimal length of the far-lead is obtained in the peak period and the peak-peak period. Under the hypothesis parameter, the optimal length of the U-turn is 300m in the peak period and 250m in the non-peak period; through theoretical analysis, the peak length of the peak is 297.61m, and the peak length of 254.21m. Introduction With the rapid development of urban transport, car ownership increased year by year, large and medium cities in the traffic pressure increasing [ bottleneck of urban transport, but also prone to traffic congestion section. In order to solve the problem of congestion at urban intersections, it is widely used to prohibit the left turn of traffic at intersections. Prohibiting the left turn of the traffic organization program refers to the use of traffic channelization of the idea, from the management means to the intersection of the left side of the interse proportion of left-turn traffic at the intersection of the intersection has an important effect on traffic capacity of the intersection, and the proportion of the left-turn traffic at the intersection is reduced turn left the vehicle can quickly reach the destination, the scholars put forward a lot of ideas, including three-dimensional, alfalfa leaf level and far from the first turn. Far to turn the idea is to turn left turn traffic into a straight turn U-turn mode, the left turn traffic to the road section to achieve indirect turn left [ many studies on the far-off, including the study of the U-turn and so on. However, the research methods are deduced by the formula or only by simple simulation [6].After simulation and statistical analysis, the length of the research needs to be carried out. As the signal intersection in time to avoid a part of the left turn traffic generated by the conflict point, it also has a greater impact on vehicle travel time at the signal intersection phase and timing [7]. Therefore, the research on the U-turn pitch of the far-off head is mainly based on the MATLAB mathematical statistical analysis software, which makes reasonable assumptions on the parameters and then uses the PTV-VISSIM micro simulation software to simulate the different U-turn length of the no-signal crossroads Time, and then through the MATLAB software for data analysis, fitting the data curve to obtain the optimal U-turn. 1114 7th International Conference on Education, Management, Computer and Society (EMCS 2017) Advances in Computer Science Research (ACSR), volume 61

The Research of Optimal Length of Left Turn with U-turn at Intersection Based on Statistical and Simulation Analysis