Open AccessRoad conditions and traffic speeds
Author(s) -
P. A. Lushnikov,
N. A. Lushnikov,
V. A. Kretov,
A. V. Kostsov
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1159/1/012023
Subject(s) - acceleration , mode (computer interface) , computer science , energy consumption , graph , movement (music) , constant (computer programming) , traffic flow (computer networking) , simulation , control theory (sociology) , automotive engineering , engineering , artificial intelligence , physics , acoustics , computer security , control (management) , classical mechanics , theoretical computer science , electrical engineering , programming language , operating system
The paper shows that from the point of view of energy consumption, the most optimal is the mode of movement with a constant speed among all possible speed modes of move-ment due to the fact that the average value of the mechanical energy of a moving car has a minimum value when driving at a constant speed. However, in real road conditions, certain sections of road do not allow moving at the selected speed and drivers are forced to change the mode of movement of the car for various reasons. The article discusses various methods for the assessment of the unevenness of the traffic flow speed, providing the use of forward accelerations, the coefficient of variation, as well as spatial and temporal speed. The study was carried out using the experimental analytical method. The paper shows that the forward accelerations of a car moving in a traffic flow have an oscillating character. Therefore, it is difficult to determine problem areas of the road that are the reasons for the decrease in speeds. It is also difficult to determine the areas where the speeds of movement change from the linear graph of the coefficient of variation, since this graph oscillates to a greater extent than the acceleration graph. As a result of the analysis and numerical calculations, it was proposed to assess road conditions by the ratio of temporal and spatial speed, which characterizes the unevenness of the speed of movement of vehicles. It is proposed to call this ratio the coefficient of speed unevenness of the traffic flow. It is shown that this indicator is more convenient for the determination of problem sections of the road. The graphs are based on the results of experimental measurements of driving speeds on specific highways. The coefficient of unevenness of speed better reveals problem road sections, since the dependence of this coefficient on the traveled distance has a much less oscillating character, which facilitates the selection of unfavorable sections of highways, in comparison with other existing indicators. The important result of this work is the proposal to use the coefficient of speed unevenness as one of the criteria for the assessment of road conditions, for example, when diagnosing highways.