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Suppressive Effect on Speed Reduction at Sag Sections by Utilizing Visual Illusions

Journal of Traffic and Transportation Engineering 2017年第2期5卷 55-62页

作者： Shuichi Matsumoto Soshiro Ueki Department of lnformation Society Faculty of Information and Communications Bunkyo University Kanagawa 253-8550 Japan

Currently about 60% of traffic jams on express highways nationwide are said to occur at sag sections, as traffic congestion at tollgates decreased significantly with the introduction of electronic ETC （toll collection system）. Therefore, in order to further decrease traffic jams on express highways, there is an urgent need to consider measures to reduce traffic congestion at sag sections. A wide variety of hardware and software has been suggested to deal with traffic jams. In this study, a measure for suppressing traffic congestion at sag sections has been proposed, expected to be low in cost and readily installed, which utilizes optical illusions for drivers. An experiment which used a driving simulator.resulted in a suggestion that setting gates at incremental intervals at uphill sag sections resulted in suppression of speed reduction in those sections.

关键词： Traffic flow sag sections illusion driving simulator.

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Investigation of Braking Timing of Drivers for Design of Pedestrian Collision Avoidance System

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Journal of Mechanics Engineering and Automation 2016年第3期6卷 118-127页

作者： Keisuke Suzuki Takuya Kakihara Yasutoshi Horii Faculty of Engineering Kagawa University Takamatsu 761-0396 Japan DENSO SALES SWEDEN AB Goteborg 417 55 Sweden

The braking behavior of drivers when a pedestrian comes out from the sidewalk to the road was analyzed using a driving simulator. Based on drivers＇ braking behavior, the braking control timing of the system for avoiding the collision with pedestrians was proposed. In this study, the subject drivers started braking at almost the same time in terms of TTC （Time to Collision）, regardless of the velocity of a subject vehicle and crossing velocity of pedestrians. This experimental result showed that brake timing of the system which can minimize the interference for braking between drivers and the system is 1.3 s of TTC. Next, the drivers＇ braking behavior was investigated when the system controlled braking to avoid collision at this timing. As a result, drivers did not show any change of braking behavior with no excessive interference between braking control by the system and braking operation by drivers for avoiding collisions with pedestrians which is equivalent to the excessive dependence on the system.

关键词： Active safety collision avoidance pedestrian brake timing TTC driving simulator.

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