EVALUATION OF THE EFFICIENCY OF ROUNDABOUTS IN MODERN CITIES
The solution to the problem of ensuring the safe and rapid movement of goods and passengers in modern cities is possible through the use of a complex of architectural, planning and organizational measures. The key principle of traffic management is achieved through the development and implementation of measures aimed at ensuring the safety of transport and pedestrian flows without worsening traffic characteristics. As an object of research in the presented work, traffic flows at ring intersections are considered. The characteristics of traffic directly depend on the geometric parameters of roundabouts and the characteristics of traffic flows. The study of the organization of traffic at ring intersections is implemented using the PTV Vissim simulation software package, which allows to continuously simulate the movement of traffic flows taking into account the specified parameters and behavioral models within the examined object. Making a decision to change traffic management schemes or reconstruct the road network based on the simulation performed in the PTV Vissim software package allows avoiding erroneous or irrational decisions, as well as additional costs. The article presents the results of research, the use of which will reduce the time spent on the movement of goods and passengers by defining optimal characteristics of roundabouts based on certain dependencies of traffic indicators on the parameters of traffic flows and configuration (radius of the central guiding island, lane of the carriageway on the approach to the intersection) of intersections of roads. In the process of modeling possible options for optimizing the intersections of the directions of movement of vehicles on the road network, a comparative analysis of certain technical and operational characteristics was performed. In the course of analytical studies, optimal types of configurations of single-level intersections of roads in cities were established and the pattern of changes in the average speed of cars from the total intensity of traffic flow was determined. Based on the conducted research, an assessment of the effectiveness of possible options for changes at the roundabouts of the road network was carried out.