Traffic signal coordination control along oversaturated two-way arterials

Area of Science:

• Transportation Engineering
• Traffic Flow Theory
• Intelligent Transportation Systems

Background:

• Traffic signal coordination control is crucial for managing congestion in oversaturated urban traffic conditions.
• Existing methods often rely on simplifying assumptions of constant traffic demand and immutable vehicle speeds, limiting their real-world applicability.
• Addressing these limitations is essential for developing more effective traffic management strategies.

Purpose of the Study:

• To develop a novel traffic coordination control method for oversaturated two-way arterials that does not rely on assumptions of constant traffic demand or immutable vehicle speeds.
• To improve traffic flow efficiency and reduce delays in congested urban environments.
• To provide a more robust and adaptable traffic control solution.

Main Methods:

• Development of a two-module system: intersection coordination control for green time planning and arterial coordination control for optimizing intersection offsets.
• Implementation of a method that accounts for dynamic traffic demand and variable vehicle speeds.
• Experimental validation of the proposed control strategy.

Main Results:

• The proposed method effectively controls queue length under oversaturated traffic conditions.
• Vehicle delay was reduced by 5.4% compared to existing delay minimization methods and 13.6% compared to methods without offset optimization.
• The method demonstrated an ability to balance delay levels across different arterial links, indicating improved overall traffic coordination.

Conclusions:

• The novel traffic coordination control method offers a significant improvement over existing approaches for managing oversaturated arterials.
• By removing restrictive assumptions, the method provides a more realistic and effective solution for reducing traffic congestion and delays.
• The balanced delay distribution highlights the method's efficiency in optimizing traffic flow across the entire arterial network.