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原文传递 Roadway Median Treatments, Phase 1 and Phase 2.

题名：	Roadway Median Treatments, Phase 1 and Phase 2.
作者：	J. L. Gattis; L. K. Ducan; M. S. Tooley; A. S. Brewer; M. Q. Le;
关键词：	crash rates,multi-lane urban roadways,multi-lane suburban roadways,arkansas;crash histories, roadway medians;
摘要：	This research project examined relationships among crash rates, cross section design elements, and other operational attributes of multilane urban and suburban roadways in Arkansas. Crash rates for four cross section categories (roadways with no median, roadways with occasional left-turn lanes, roadways with continuous two-way left turn-lanes, and roadways with raised or depressed medians) were compared. Freeways were not considered. Crash histories were examined for cross section types, speed limits, volumes, widths of through lanes, presence of curb or shoulder, outer shoulder widths, median widths, and the densities of various types of access. Some variables were correlated, and it was suspected that such correlations can skew crash prediction models. Generally, the raised or depressed median group had slightly lower crash rates. The findings can help planners and designers when selecting the median type and cross section design for multilane roadways in rural areas that face future urban development, and in urban areas. / Title Note: Final rept. 31 Jan 2007 - 01 Feb. 2010. / Supplementary Notes: Sponsored by Department of Transportation, Washington, DC. University Transportation Centers Program. and Department of Transportation, Washington, DC. Research and Special Programs Administration. / Availability Note: 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 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A06 / NTIS In-house Control Codes: dotour/dotrsp;12091,1101
报告类型：	科技报告