街路におけるプロビーム道路照明の視認性評価に関する基礎的研究  [in Japanese] Fundamental Research on Visibility Performance under Pro-Beam Road Lighting  [in Japanese]

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Abstract

<p>本研究では、一般に広く使われている対称照明と比較し、プロビーム照明下における歩行者視認性のメリットを明らかにすることを目的に、対称照明と簡易プロビーム照明をテスト走路に設置し、実験参加者 12 名による車内から歩行者を視認させる実験を実施した。街路での利用を踏まえたプロビーム照明専用の灯具は実在しないため、既存の灯具を工夫して理想配光に近い簡易プロビーム照明を製作し、実験に使用した。実験時は霧雨で路面が若干湿った状態であった。評価実験の結果、道路の横断方向と縦断方向を考慮すれば、プロビーム照明は対称照明に比べて歩行者を視認しやすく、また視認距離や車両と歩行者の位置関係による影響も小さいことが分かった。道路上の歩行者を視認する上で、プロビーム照明は潜在的に高い性能を有することが示唆された。</p>

<p>The present study proposed a new road lighting using the pro-beam light distribution. Visibility performance provided by the current conventional road lighting brings some issues of concern in terms of changes of pedestrian visibility depended on positional relationship between location of pedestrian and luminaries. A field experiment was conducted on a test track using 12 participants. In this experiment, as simplified pro-beam road lighting was used to evaluate an effect of positive contrast consistently on visibility of pedestrian on the test track. We evaluated visibility performance of the pro-beam road lighting compared with the conventional road lighting. Visibility level assessed by the subjects were measured on the test track. Results of the experiment indicated that visibility level of the pedestrians under the pro-beam road lighting was larger and constant rather than that under the symmetric road lighting. The pro-beam road lighting proposed by the present study might have a potential to show more positive effects on the road.</p>

Journal

  • JSTE Journal of Traffic Engineering

    JSTE Journal of Traffic Engineering 3(2), A_84-A_91, 2017

    Japan Society of Traffic Engineers

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