Introduction. Interchange designs that provide specific benefits to road users will always be of interest. It is extremely interesting a type of interchange in the same level named in literary sources as a «hamburger roundabout» or «throughabout». Usually, two separate lanes run through the extended roundabout, crossing each other inside the interchange. Such intersections can be regulated by both road signs and traffic lights, depending on their size and the intensity of incoming traffic flows.
Problem Statement. The analysis of the designs of the intersection at one level by the type of throughabout is insufficiently presented both in the normative documentation for the design of highways and in modern scientific periodicals. However, this type of intersection refers to alternative junctions used in road construction practice in European countries. Thus, an urgent task is to evaluate the operational efficiency indicators and surrogate traffic safety indicators of the throughabout, which can later serve as a basis for making decisions about the need to construct this type of intersection.
Purpose – to identify the main problems of the interchange by the type of throughabout based on the analysis of traffic efficiency and safety indicators, carried out by the method of traffic microsimulation.
Materials and methods. The main method of analyzing the performance indicators of a interchange is microsimulation modeling using the PTV Vissim software. Traffic safety at the intersection was assessed by surrogate indicators obtained by extracting vehicle trajectories from a traffic simulation model and analyzing them in the SSAM program.
Results. The analysis of the configuration of the “ throughabout “ type of interchange was carried out, the bottlenecks of this configuration and the localization features of various types of vehicle conflicts were identified.
Conclusions. The indicator of the average delay of vehicles (c/car) will increase significantly when the traffic load at the intersection is 3,600 cars/hour, while the saturation of the transport node is observed, the throughput capacity of the intersection is exhausted. Most often, vehicles driving through a throughabout face the problem of rear-end conflicts.
