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原文传递 Trends in Fatal U.S. Crashes in Darkness: 1900 to 2006.

题名：	Trends in Fatal U.S. Crashes in Darkness: 1900 to 2006.
作者：	sullivan, j. m. flannagan, m. j.
关键词：	pedestrians, collisions, risks, visibility, vehicle lighting, rural areas, urban areas, headlighting, daylight, traffic safety, accident prevention, lighting systems, drinking drivers, speed
摘要：	Fatal crash trends in the United States between 1990 and 2006 were examined for changes in the ratio of crashes in darkness to crashes in daylight to determine whether recent improvements in vehicle forward head-lighting might have influenced the dark/light ratio. A general decline in the ratio was observed among all fatal crashes, although partitioning of the data suggests this trend is only present among crashes involving drinking drivers. In an analysis of pedestrian crashes, an increasing trend in the dark/light ratio was observed. When the data were further partitioned based on the age of the victim, a decline was observed among adult victims and increases were observed among children and older victims. These differences in the ratio trend suggest that the dark/light ratio may be influenced by many factors and it may be difficult to associate it with any one factor, such as improved vehicle lighting. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0825；33p
报告类型：	科技报告