QUANTITATIVE EVALUATION OF THE INFLUENCE OF SHADOW DURATION ON THE RATE OF WINTER TRAFFIC ACCIDENTS

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  • 日陰時間が冬期交通事故発生率に与える影響の定量的評価

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The rate of traffic accident in winter can be affected shadow duration on road surface because shadow on road surface causes slippery road due to freezing and snow accumulation. This study examined the relationship between shadow duration on road surface and the rate of traffic accident on national highways in Sapporo city.<br>As a result, the rate of traffic accident increases at the place where shadow duration is long in winter, and the increasing ratio of traffic accident rate due to shadow duration increase in winter is 2 times greater than the increasing ratio of traffic accident rate due to shadow duration increase in summer. This trend is significant near intersections, and the increasing ratio of traffic accident rate due to shadow duration increase near intersections in winter is 4 times greater than the increasing ratio of traffic accident rate at basic road sections.

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