Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Incorporating Driver Relaxation into Factory Adaptive Cruise Control and its Implications on Traffic Operation

Version 1 : Received: 9 August 2021 / Approved: 10 August 2021 / Online: 10 August 2021 (09:02:30 CEST)

How to cite: Zhou, H.; Laval, J. Incorporating Driver Relaxation into Factory Adaptive Cruise Control and its Implications on Traffic Operation. Preprints 2021, 2021080216 (doi: 10.20944/preprints202108.0216.v1). Zhou, H.; Laval, J. Incorporating Driver Relaxation into Factory Adaptive Cruise Control and its Implications on Traffic Operation. Preprints 2021, 2021080216 (doi: 10.20944/preprints202108.0216.v1).

Abstract

Current adaptive cruise control (ACC) systems adopt fixed desired time headway, which leads to an abrupt speed reduction after being cut-in by a lane changer in front or when changing lanes too close to the new leader. In contrast, human drivers behave differently and feature a variable spacing within 20 or 30 seconds right after a cut-in or lane change. Motivated by the smooth transition found in driver relaxation, the paper aims to incorporate relaxation into ACC systems. Based on the open-source ACC platform, Openpilot, Comma.ai, the paper proposes a feasible relaxation model compatible with current factory ACCs, which has also been tested using a market car with stock ACC hardware. The study further investigates the impact of relaxation ACC on traffic operation. Numerical simulation suggests that incorporating relaxation into ACC can help: i) reduce the magnitude of speed perturbations in both cut-in vehicles and followers; ii) stabilize the lane-changing traffic by reducing the speed variance and prevent the lateral propagation of congestion, and iii) increase the average vehicle speed and capacity in merging traffic.

Keywords

factory ACC; driver relaxation; traffic operation

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