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原文传递 State Route 37 Safety Evaluatrion "Report (Supplimerial Report)

题名：	State Route 37 Safety Evaluatrion "Report (Supplimerial Report)
作者：	Ahmad Khorashadi
关键词：	Rumble snip, median barrier, state route 37, double fine zone, construction phase
摘要：	The original scope of this project was to determine the accident impact of median striping and double fine zone regulation on 2 and 3 lane conventional roads. However, several other improvement projects were implemented on the test segment (state route 37) that was intended to be used for this study. The combination of many other improvements including road widening, installation of concrete median barrier and rumble strip, and shoulder widening made it impossible to determine the impact of median striping. Therefore, the scope of the study was changed. It was decided to examine the impact of the double fine zones (DFZ) legislation and median striping on road safety be studied in separate reports. The first of this two part report entitled "Safety Enhancement, Double Fine Zone" was published in December 1997. This report provides an accident impact of all other improvements (excluding the DFZ impact) on state route 37. The report shows a general decrease in Total, Fatal, Fatal plus Injury, Head-On, Sideswipe, and Run-Off-Road accidents. The decrease is statistically significant for Fatal, Head-On, and Sideswipe accidents at 95 percent level of confidence. The improvements are associated with a general decrease in accident frequencies and significant reduction in mote severe accidents. The percent reductions reflect not only the effect of the improvement project but also the effect of other factors such as widening, superelevation improvement, rumble snip and median barrier installation, and enhanced enforcement project.
报告类型：	科技报告