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Highway agencies have traditionally managed the safety improvement process by identifying and correcting high-crash locations (“hot-spots”), where concentrations of crashes and, often, patterns of crashes of similar types, were found. However, when crashes are evaluated over too short a period of time (3 years or less), locations may be identified as hot-spots simply due to the random nature of where crashes occur.

The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 285: Developing a Guide for Quantitative Approaches to Systemic Safety Analysis describes the research methodology and findings that supported the development of a systemic safety - an alternative (or supplement) to the hot-spot approach - analysis guide and associated training materials.

The document is supplemental to NCHRP Research Report 955:Guide for Quantitative Approaches to Systemic Safety Analysis.