Assessment of the influence of vehicle parameters on the value of the saturation flow

Abstract

As a result of the changes that the car market has undergone over the past decades, a large number of various cars have appeared on the road, which are excellent primarily in design characteristics (length, width, height, weight, etc.), as well as dynamic (power, braking time, turning radius, etc.). When they are taken into account as the characteristics of a conventional car, incorporated into the initial model for calculating the parameters of a controlled intersection, it is possible to obtain variable data that will affect the final result — the value of the saturation flow. In order to determine the variability of the saturation flow values, taking into account certain parameters of a conventional car, the study presented in this article was carried out. The main objectives of the study were to analyze the composition of the traffic flow; determining the design and dynamic characteristics of the most common vehicles in the stream; establishing the parameters of a conditional car, determined by the calibrated one and calculating the saturation flux with subsequent comparison of the data obtained. When carrying out the research, the methods of field observations, analysis and mathematical calculation were used. The calculations were performed using a mathematical model used to determine the value of saturation flux when performing a turn, depending on the turning radius. In the study, this model was determined as the main one due to the fact that on many sections of the road network the turning radii change significantly, in contrast to the basic model, which depends on the lane width, which in most cases is standardized or does not change as much as turning radii. Based on the results of calculations, the variability of the ST values was obtained at 7% for the minimum value of the turning radius and 20% for the maximum value, which requires further research to assess the influence of the obtained results on the calculated parameters of the traffic light operation — the duration of the main ticks and the duration of the entire cycle, as well as on the parameters the transport stream itself when establishing new, refined work cycles.

Keywords

• traffic light regulation
• saturation flow
• composition of traffic flow
• cars
• technical parameters of a conventional vehicle turning radius