Graphic Analysis of Shock Wave Propagation in the Oversaturated Links of Coordinated Signal Systems

In this paper, a BASIC program is developed to analyze the propagation of shock waves from link to link of coodinated signal system and to draw them on the time-space diagram of the graphic display. Although the road, traffic and signal conditions can be arbitrarily given, it is assumed that the traffic is oversaturated. The program is based on the traffic model derived by P. G. Michalopoulos et al and supplemented by K. Ikenoue. By using personal computer, not only the shock waves are obtained, but also the total travel time and inflow traffic from main and cross streets are easily calculated.