Experimental study of short range interactions in vehicular traffic

TL;DR

This study analyzes short-range vehicle interactions on a highway using magnetic loop data, revealing strong velocity correlations, headway distributions, and inter-lane structures, providing insights into traffic dynamics.

Contribution

It provides new empirical measurements of velocity correlations and headway distributions between non-neighbor vehicles and across lanes in stationary traffic.

Findings

Strong velocity correlations in vehicle platoons of 7-8 vehicles

Detailed headway distribution data for non-neighbor vehicles

Insights into inter-lane headway structures and passing maneuvers

Abstract

Single vehicle data obtained from magnetic loops on an expressway allowed us to measure velocity correlations and velocity differences between non--neighbor vehicles on the same lane, showing some strong correlations even for platoons of 7 or 8 vehicles. The corresponding time headway distribution for non--neighbor vehicles is also presented. We were also able to get some informations about inter--lane structures, through crossed time headway distributions. It should be noticed that these last results on crossed time headways are meaningful only because the subset of data we used corresponds to a unique stationary traffic state -- and still contains a large amount of data, with a large fraction of short time headways. The link with passing maneuvers is discussed.