The distance of midblock crosswalks directly influences traffic flow stability and operating efficiency. Considering the present situation of urban transportation in China, the reasonable distance of midblock unsignalized crosswalks was studied combined with the characteristics of vehicle traffic flow and pedestrian flow. In the peak hour traffic environment, eleven kinds of pedestrian crossing distance were designed (150m～400m, gap is 25m) in simulation model Vissim. Data of average speed time series, vehicular delay and pedestrian delay under time scales of 1s, 5s and 10s were obtained. The largest Lyapunov index of average speed time series was used to identify the influence of crosswalk distance over vehicle traffic flow stability. Vehicular delay and pedestrian delay were utilized to reflect the relationship among the distance of midblock crosswalks, vehicle flow efficiency and pedestrian crossing efficiency. This research takes the midblock management mechanism into consideration, balances the relationship among traffic flow stability, efficiency and pedestrian efficiency, and puts forward the recommended midblock crosswalk distance.
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