CAPACITY AND TRAFFIC CONDITIONS AT UNSIGNALISED INTERSECTIONS APPROACHES SITUATED IN TRAFFIC SIGNAL NETWORKS

The studies and analyses undertaken by the authors were aimed at goals; first to select the proper method and work out a research (simulation model), and second to determine the parameters and magnitude of their impact on the capacity and traffic conditions minor approaches to unsignalised intersections. Results of the simulation experiment made it possible to quantify the impact of traffic flow disruptions caused by the traffic signals, on the capacity of minor approaches at priority type intersections. Comparison of results with the ones from the HCM procedure revealedits insensitivity to a few significant effects resulting adjacent traffic signals, namely rate of side inflows in traffic flows leaving signalised intersections, and the range of platoon dispersion or different impact of impedance than at isolated intersections. It has been shown that models of queue length and vehicular delay estimation, adequate for isolated priority intersections and applied in the case of the influence of traffic signals, can lead to significant errors. (a)