INFLUENCE OF GEOMETRIC PARAMETERS OF ROUND INTERSECTIONS OF SMALL RADIUS ON STREET CAPACITY OF POPULATED POINTS

The question of the expediency of changes in geometric parameters in terms of their influence on the carrying capacity of the street and road network of the city of Kyiv studied. Experimental studies of the influence of the height of the ring island on the level of delay of vehicles were carried out. The requirements of modern normative documents on this issue studied. A number of researchers have proposed different capacity estimation models, such as flow gap acceptance model, leader movement models, empirical regression models, etc. The purpose of the publication is to find engineering solutions for finding optimal geometric parameters for the equipment to perform its functions without significant losses in motion. Because of the research, it was found that the delays of vehicles at the approach to the central ring do not have a significant effect on the speed of traffic flow, however, the speed of traffic flow can have a significant decrease in the case of an increase in the height of the central ring. It was found that when using the central ring, built according to 10% of drivers who come across a ring intersection, they take a direct route, ignoring the existing requirements of road signs, markings and Traffic rules, which may indicate the partial ineffectiveness of the implemented measures and a proportional increase in the danger at the site due to an unexpected maneuver, which becomes possible due to the imperfect geometric features of the central ring. Thus, in connection with the identified circumstances, there is a need to change the approaches to design, which would include a mandatory increase of the central ring to the level of 15 cm, and to make changes to the existing standards. Such measures will provide an opportunity at the legislative level to standardize the imperfections of means of calming and regulating traffic, first, in populated areas.