Shirin V. Increase of urban road network operation efficiency

The object of the study is the traffic in cities. The aim of the thesis is to improve the efficiency of the urban road network by preventing the congestion mode of the traffic flow. In solving problems there were applied mathematical modeling methods, macro-and micro-simulations of the traffic flow, regression analysis and simulation. Scientific novelty. For the first time there was determined the parameters dependence of traffic speeding change on approach to the signal-controlled junction from junction capacity, signal control cycle variable and the queue length of travel that allows changing the speed limit on the approach to the congestion zone to prevent its occurrence. There was also improved the dependence of motor traffic speed from safety distance in the stream, which is based on velocity determination of the vehicle in congestion mode not only from the distance to the car in front, but also on its speed, which contributes to the characterization of the movement of vehicles in congestion modes. Further there was developed the methodology for evaluating the performance of the road network, in which it was proposed to determine a general indicator for evaluating the performance of the road network on the basis of taxonomic analysis, which allows combining performance indicators of different physical nature. Practical results. There were developed simulation models for study of traffic flow congestion driving mode, the methods of reducing the intensity of traffic on the approach to controlled junctions to prevent congestion, which can be used in the control algorithm of automated traffic management systems. Practical implementation of the given work is to use software to determine the parameters to reduce traffic congestion on the approach to controlled junctions in the automated system of traffic management "COMCON ATMS" of Research and Production Enterprise "System+Service". The offered efficiency estimation of the urban road network performance was introduced in the Department of Transport and Communications of Kharkov City Council to evaluate the routing schemes for passenger transportation in Kharkov. The developed simulation model for determining the parameters of preventing congestion was applied in the Department of Transport and Communications of the Kharkov City Council in the development of measures for traffic management on the road network in Kharkov. The results of the study are applied at Kharkov National Automobile and Highway University in teaching undergraduates on specialty 7.07010101 "Transport Systems", 7.07010104 "Traffic Management."