Cyclists Behavior and Mechanism of Traffic Accident Occurrence involving Cyclists

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  • 交通環境における自転車の走行状況と交通事故発生要因について
  • コウツウ カンキョウ ニ オケル ジテンシャ ノ ソウ コウジョウキョウ ト コウツウ ジコ ハッセイ ヨウイン ニ ツイテ

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Abstract

The purpose of this study is to clarify the mechanism of traffic accidents involving cyclists. First, cyclist behavioral characteristics were obtained at an intersection in a city in Tokyo, where cyclists’ collisions had often occurred. The major mechanism of the accidents involving cyclists was due to a combined effect of cyclist behavior, such as the average bicycle velocity of 3.09 m/s at the initial line of an intersection, and the low visibility due to a box-type building （an obstruction） at the corner of the intersection. Second, near-miss situations captured by drive recorders installed in passenger cars were investigated. Since the similarities of the approach patterns between near-miss incidents and real-world fatal cyclist accidents in Japan were confirmed, we analyzed the 229 near-miss incident data via video capturing bicycles crossing in front of forward-moving cars. The average time to collision in the cases where bicycles emerged from behind obstructions was shorter than that in the cases where drivers had unobstructed views of bicycles. When both a cyclist and a car driver have low visibility due to obstructions, they would have a higher potential to meet a car-to-cyclist accident. The present results might become a basis for the countermeasure to prevent traffic accidents involving cyclists.

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