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Phase transitions in traffic flow on multilane roads.

Boris S Kerner¹, Sergey L Klenov

¹GR/PTF, HPC, G021, Daimler AG, 71059 Sindelfingen, Germany. boris.kerner@daimler.com

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 7, 2010

Summary

Vehicular traffic dynamics are explained by spatiotemporal phase transitions. These transitions, involving synchronized flow and moving jams, reveal complex traffic patterns on multilane roads.

Area of Science:

Physics
Traffic Engineering
Transportation Science

Background:

Traffic flow exhibits complex dynamics, including moving jams, which are not fully explained by existing models.
Understanding these dynamics is crucial for improving highway safety and efficiency.

Purpose of the Study:

To reveal the physics of spatiotemporal phase transitions in traffic flow on multilane roads.
To explain the complex dynamics of moving jams using empirical and numerical analyses.

Main Methods:

Empirical analysis of vehicular traffic data from American highways.
Numerical simulations of traffic flow dynamics.
Analysis of single vehicle data from video camera measurements.

Main Results:

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Identified three traffic phases: free flow, synchronized flow, and wide moving jams.
Demonstrated that lane changing, merging, and exiting cause diverse phase transitions.
Explained moving jam dynamics via the nucleation-interruption effect in synchronized flow, leading to random jam emergence and dissolution.
Observed diverse congested patterns at bottlenecks due to phase transitions.

Conclusions:

Spatiotemporal phase transitions are fundamental to understanding traffic flow physics on multilane roads.
The nucleation-interruption effect in synchronized flow accurately explains observed moving jam dynamics.
Phase transitions contribute to complex, non-regular traffic patterns and congestion at bottlenecks.