Abstract: Overflow phenomenon of pedestrian is common at signalized intersections. Video-processing technology is used to acquire detailed spatio-temporal data of the pedestrian, and the underlying law of the overflow phenomenon is analyzed; then optimization strategies to restrict the overflow are proposed. First, the universality of the overflow phenomenon is demonstrated with the frequency of pedestrian overflow. Second, the effect of the intention of choosing short rout on the overflow is analyzed through the actual survey data. Third, the trajectories of overflow pedestrian are obtained, from which we can obtain the distribution of the overflow positions; on the basis of this, the normal distribution model of the overflow positions is established using the method of probability and statistics, and validated with actual data at other intersections. Finally, the optimization strategies to restrict and prevent the pedestrian from overflowing the crosswalk are adopted at the intersection. Results show that the overflow is obviously reduced as the widen width and the guard rail length reach to 130% of the crosswalk width.

Key words: engineering of communications and transportation system, signalized intersection, pedestrians crossing, pedestrian trajectories, overflow positions