Influence of the roundabout traffic scheme project instead of the unregulated intersection of city streets on the transport delay duration

Abstract

The increase of the motorization level in cities causes congestion of the road network (RN) of settlements. Research on the given problem is a topical task because the analysis of traffic management schemes speaks for the low level of traffic safety and many accidents on arterial streets and roads. It leads to the occurrence of accidents, in particular, the number and duration of traffic jams increases. Also, the increase in traffic delays increases the level of environmental pollution.

It should be noted that the important factor for increasing traffic safety concerning the aforementioned problems is an effective traffic organization at the intersections and approaches to them. This will allow reducing traffic delays in private transport and increasing the speed of public transport. Traffic intensity, capacity, volume-capacity ratio, and traffic conditions, besides the speed of movement, are the main parameters of traffic flow. That is why the design of new schemes of traffic organization or redesign of existing schemes on arterial roads should be based on the results of computer simulations of the main parameters of traffic flows. On the city RN, the expansion of the roadway is often impossible because of adjacent buildings. The alternative to the improvement of traffic conditions and the increase of safety of all road users is the change of the scheme of traffic management or redesign the intersection.

In this study, the application of the modern methods of simulation for the investigation and justification of the change of the traffic organization scheme is researched. The changes in the main parameters of traffic flow in the existing traffic management scheme at the unsignalized intersection and after a redesign of the intersection to the roundabout are investigated by the simulation. The duration of traffic delays on every approach to the intersection in different schemes of traffic management is analyzed. With the use of the simulation model, attention is paid to the necessity of the application of circular motion for the improvement of traffic conditions of urban public transport. It is established that the arrangement of circular motion at the unsignalized intersection of city street contributed to the reduction of queue length on the approaches to it. Also, the redesign of the intersection shows the reduction of traffic delay duration.