A New Approach to Determining Road Capacity

The objective of the study is to analyse capacity of a road which depends on many factors. The formula underlying the regulatory methodology for determining capacity relates the actual capacity to the maximum capacity through the final capacity reduction coefficient, consisting of the product of seventeen partial coefficients.

According to this methodology, it is recommended to use no more than six partial coefficients in calculations while defining a set of these partial coefficients for each specific case. And this is where the problem of choosing the most significant partial coefficients arises.

One of the central streets of the city of Vladimir, Gorky Street, was chosen as the object of study.

The objective was achieved with the observation method and experimental studies of intensity of vehicle traffic on the considered street.

Several cross-sections were selected along the length of the street for measuring traffic intensity and composition of traffic flow during rush hour. The parameter being determined is the final coefficient of reduction in road capacity. It was calculated for each lane in the cross-section area. Then, its values were averaged over even and odd sides of the street, as well as along the length of the entire street.

This work uses, as an example, due to the small number of cross-sections, geometric interpolation with a Lagrange polynomial. Next, the maximum interpolation error was determined, and graphs were drawn of the dependences of the experimental and interpolated curves of the final coefficient of reduction in road capacity for even and odd sides of the street, as well as along the length of the entire street. For practical purposes, it is necessary to choose an interpolation method that will provide the minimum error. Thus, having a mathematically described curve, it is possible to determine the value of the final capacity reduction coefficient for any cross-section of the street.

The work has resulted in development of a methodology for experimental determination of road capacity, which allows one to determine the final capacity reduction coefficient for a specific, already existing road.

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