Influence of the distribution of traffic flows on the speed of communication on segments of city streets with controlled traffic

Abstract

The aim of this stage of the study is to identify patterns of influence on the speed of communication of the distribution of traffic flows at the closing segment of the regulated intersection. In modern world practice of traffic management (ODD), the parameter «message speed» is used as the main criterion for assessing the level of service (level of service– LOS) of traffic flows by a regulated street-road network. At the same time, the basic element of the analysis of regulated street-road networks is the segment, which includes driving the street and closing its intersection. At the previous stage of the study, regression equations «speed – intensity2 were obtained for 156 segments with controlled movement in Dushanbe, the free terms of which are accepted as the values of speed in free conditions. Based on the obtained speed values in free conditions, service level rating scales have been developed. After developing an assessment scale for service levels, it was decided to identify patterns of influence on the message speed and service level of the ODD characteristics in regulated segments. The list of ODD characteristics in regulated segments is quite wide, since it includes the geometric parameters of the segment, the availability of access points to the carriageway from the adjacent territories, the presence of public passenger transport stopping points, and the presence or absence of means to calm traffic. In foreign studies, the influence of the combination of traffic density and segment length on the communication speed has already been examined. Therefore, at this stage of our study, we decided to identify patterns of influence on the speed of communication of the distribution of traffic flows in the traffic directions at the closing intersection segment, including the effect of the presence or absence of a left-turn conflict movement. It is possible to consider a wide range of combinations of segment length and the distribution of traffic flows along the directions of movement at the closing intersection using micromodeling, and the PTVVISSIM program was chosen for this. The performed stage of the study confirmed the effect on the speed of communication of uneven distribution of traffic flows in the directions of movement at the closing intersection, including the effect of the presence or absence of a left-turn conflict. The following steps should be considered: the impact of public passenger transport stopping points; the presence or absence of street parking; the presence or absence of means to calm the traffic.

Keywords

• segment of a city street
• communication speed
• speed in free conditions
• level of service