Development of a method for evaluation of the efficiency of the coordinated type of management as referred to main streets

Dorokhin, Sergei; Ivannikov, Valery; Likhachev, Dmitry; Artemov, Alexander · 2023 · Crossref

DOI: 10.1051/e3sconf/202337604016

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Summary

This paper addresses the lack of effective criteria for evaluating the feasibility of coordinated traffic management (green wave systems) on main streets under low or non-peak traffic loads. While coordinated control is standard for oversaturated networks, its application in unsaturated conditions requires justification to ensure it improves traffic flow characteristics rather than encouraging excessive speeds or causing unnecessary delays. The authors aim to develop a method to assess the efficiency of this management type by analyzing existing calculation methods and conducting a full-scale study and simulation of a specific urban corridor. The methodology combines theoretical analysis of foreign and domestic evaluation metrics with empirical simulation. The authors review the Coordination Factor (CF), which assesses feasibility based on the ratio of average traffic intensity to storage space, and domestic delay calculation formulas that account for standard delay, progression coefficients, and additional random arrival delays. The experimental design focuses on Leninsky Prospekt in Voronezh, Russia, specifically examining intersections with Brusilova, Dimitrov, and Minsk streets. The study utilizes simulation to compare delay values with and without coordinated control, varying two key parameters: the degree of saturation (traffic load) and the distance between adjacent intersections. The results indicate that introducing coordinated regulation reduces average delay by approximately 21% when the degree of saturation is 0.9. Specific intersection data shows delay reductions ranging from 17% to 30%. The analysis reveals that coordinated control is most efficient at a saturation degree of 0.7, where the difference in delay between coordinated and uncoordinated scenarios exceeds 30%. Regarding geometric factors, the study found that increasing the distance between intersections by 100 meters increases delay by an average of 5%, regardless of whether coordination is applied. Consequently, the coordination of traffic lights does not provide a significant advantage over uncoordinated control when the distance between intersections varies under similar conditions. The significance of this work lies in establishing specific conditions under which coordinated control is justified. The authors conclude that a saturation degree of 0.7 (comfort level C) is a critical threshold for determining the effectiveness of coordinated management, provided the transit capacity flow is at least 70%. The study demonstrates that effectiveness can be evaluated by monitoring changes in delay values relative to transport characteristics (saturation) and geometric characteristics (intersection spacing). These findings provide a basis for optimizing traffic control strategies in urban environments where traffic loads fluctuate, moving beyond simple peak-load assumptions. Future research directions identified include analyzing movement speeds and establishing patterns of parameter changes from established control modes.

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