Original publisher: Washington, DC: U.S. Dept. of Transportation, Federal Highway Administration,  OCLC Number: (OCoLC)730518005 Subject: Rural roads -- Management. Excerpt: ... 2 Identifying Safety Issues Determining what the problems are and where they are occurring will assist in making the most informed decisions regarding countermeasure selection and implementation to address intersection safety issues. When conducting a safety analysis, a minimum of 3 years of data is desired to obtain an accurate picture of the crash history within a jurisdiction, since crashes are relatively rare events and are not universally distributed across all intersections. A relatively large representative sample size for crashes in the jurisdiction will increase the chance that locations with the most severe safety issues will be identi ed. Due to the possibility of changes in tra c patterns and the roadway itself, data more than 5 years old are typically not desirable for assessing safety issues. Analysis can range from simple q push pin q maps for identifying crash clusters to statistical analyses of crash rates, depending on the crash history and other data available. There are a number of information sources used to identify crashes and risk factors at rural intersections. These include: State and local crash databases; Law enforcement crash reports and citations; Observational information from road maintenance crews and law enforcement; and Public notification of safety concerns. In order to determine the intersections with a history of crashes ( and those with a potential for future crashes ), it is important to consider the types of data available and how those data can be used. In addition to the location of the crashes, the data can also provide information regarding crash causation to help identify potentially e ective countermeasures. The types of data available can range from anecdotal information, such as public input, to crash databases provided by...Excerpt: ... 2 Identifying Safety Issues Determining what the problems are and where they are occurring will assist in making the most informed decisions regarding countermeasure selection and implementation to address intersection safety ...
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