Coherent Moving States in Highway Traffic (Originally: Moving Like a Solid Block)

TL;DR

This paper demonstrates through simulations and real data that increasing vehicle density on highways can lead to a coherent, solid-like traffic state characterized by synchronized movement and reduced lane changes, enhancing flow stability.

Contribution

It introduces the concept of a cooperative, coherent traffic state emerging from competitive interactions, supported by simulation results and empirical Dutch traffic data analysis.

Findings

High vehicle density induces a transition to a highly correlated, solid-like traffic state.

This state features reduced lane changing and stable, high flow rates.

The coherent state disappears beyond a critical vehicle density.

Abstract

Recent advances in multiagent simulations have made possible the study of realistic traffic patterns and allow to test theories based on driver behaviour. Such simulations also display various empirical features of traffic flows, and are used to design traffic controls that maximise the throughput of vehicles in heavily transited highways. In addition to its intrinsic economic value, vehicular traffic is of interest because it may throw light on some social phenomena where diverse individuals competitively try to maximise their own utilities under certain constraints. In this paper, we present simulation results that point to the existence of cooperative, coherent states arising from competitive interactions that lead to a new phenomenon in heterogeneous highway traffic. As the density of vehicles increases, their interactions cause a transition into a highly correlated state in which all vehicles practically move with the same speed, analogous to the motion of a solid block. This state is associated with a reduced lane changing rate and a safe, high and stable flow. It disappears as the vehicle density exceeds a critical value. The effect is observed in recent evaluations of Dutch traffic data.