A STUDY ON EFFECT OF PACE MAKER LIGHT ON CAR-FOLLOWING BEHAVIOR

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  • 走光型視線誘導灯によるドライバーの追従挙動への影響分析

Abstract

There has been an increase in the cases of installation of the Pace-maker light (hereafter, PML) as a countermeasure against traffic congestion at sag bottlenecks of freeways in Japan. PML creates a flow of LED light traveling with constant speed alongside the car. It intends drivers to perceive the speed gap between PML and their own vehicles and encourage the spontaneous speed recovery on uphill section at sag. It has been reported that traffic congestion at some bottlenecks were mitigated due to the installation of PML, though its influence on the driving behavior and the mechanism of congestion-mitigation were still unrevealed. In this study, based on a car-following experiment conducted on the Hanshin Expressway Route 3. We arranged inter-vehicle distance data considering the overall trend and individual trend, and we analyzed from the following three points; 1) the influence of PML on traffic capacity, 2) the effect of PML on the stability of car-following behavior of the entire driver, 3) the influence of PML on collision risk in car-following condition. As a result, 1) drivers tend to spontaneously adjust the speed to the PML speed, which result in an improvement in traffic capacity. 2) There is a possibility that it may be improved as the variation of the acceleration / deceleration change becomes smaller at the time of PML operation. 3) It was found that the risk of collision does not rise in the car-following condition even during PML operation.

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