A police car has a distinguishable outward appearance. Due to its atypical usage in police activities, police car visibility is important to prevent collisions with other traffic parties. In the current study, a fundamental investigation of computer-based experiments was conducted to clarify the inuence of vehicle rear end designs on the estimation of headway distance. Results revealed that estimated headway distance deteriorated when "POLICE" signage was supplemented. Furthermore, it was also revealed that an alteration, through the addition of an underline to the "POLICE" signage, would likely improve the estimation of the distance within this experimental environment. パトカーは,警察活動における特殊な使われ方のため弁別されやすい外観をしているが,他の交通参加者 との衝突を防ぐためにはパトカーの視認性は重要である.本論文では車両後部デザインの変更が車間距離の 評価にどのように影響するか,コンピューター画面による実験で基礎的な検討を行った.結果, 「POLICE」 表記を付加すると車間距離の評価に影響を及ぼす可能性があること,および「POLICE」表記に下線を追加 することによりこの実験環境では距離の評価が改善し,改善案になり得ることが判明した. (キーワード:認知,錯覚,デザイン,車間距離,パトカー) 1 受付:2016年7月15日 受理:2016年9月29日 2 科学警察研究所交通科学部
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