Breakdown in vehicular traffic: driver over-acceleration, not over-reaction

TL;DR

This paper challenges the common belief by demonstrating that driver over-acceleration, rather than over-reaction, causes traffic breakdown, supported by a new microscopic traffic flow model that explains empirical observations.

Contribution

Introduces a mathematical model that attributes traffic breakdown to driver over-acceleration, excluding over-reaction, and explains empirical nucleation features.

Findings

Traffic breakdown is caused by driver over-acceleration.

The model explains empirical nucleation features of traffic breakdown.

Over-reaction is not the primary cause of traffic breakdown.

Abstract

Contrary to a wide-accepted assumption about the decisive role of driver over-reaction for breakdown in vehicular traffic, we have shown that the cause of the breakdown is driver over-acceleration, not driver over-reaction. To reach this goal, we have introduced a mathematical approach for the description of driver over-acceleration in a microscopic traffic flow model. The model, in which no driver over-reaction occurs, explains all observed empirical nucleation features of traffic breakdown.