Influence of signal on the capacity of signalized intersection

Abstract:

In order to describe capacity of intersections, and take the factors such as intersection geometric feature, traffic flow characteristic, channelized section and regulation measures into account, this research exprersses the basic phase set based on graph theory through the analysis of conflict movements. Then the common expression of capacity is gven by equations. The four-leg intersection is analyzed as an example, whose necessary and sufficient condition is derived. At last, the optimization model of intersection capacity is established. The results show that the signal parameters greatly influence the intersection capacity. Equivalent saturation degree assignment is actually intersection capacity maximal control. For common four-leg intersection, the sufficient and necessary condition for capacity is that the sum of flow ratio equals 2.