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                Highway Safety Manual Data Needs Guide
**Description:**
        This document identifies the data needs for using the 1st edition of the Highway Safety Manual (HSM). The guide focuses on the data required to use the Part C methodologies for rural two-lane highways, rural multilane highways, and urban and suburban arterials. The guide provides information for potential users to evaluate whether their existing data sources contain the data needed to apply the HSM safety prediction methodologies. Data elements required for analysis are described, including specific definitions.
    
    
    
    
          **Owner Source:**
        organization
    
          **Sponsor/Owner:**
        National Cooperative Highway Research Program (NCHRP)
    
        **Published:**
      2017
    
        **Availability:**
      The guidebook is available free of charge at the following link: HSM Data Needs Guide.
    
          **Disclaimer:**
        This information is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained herein. This information does not constitute a standard, specification, or regulation. The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturer's names appear in this information only because they are considered essential to the objective of this publication.
          Any opinions, findings, and conclusions or recommendations, and translations thereof, expressed in this publication are those of the author(s) and do not necessarily reflect the views of the Federal Highway Administration. U.S. DEPARTMENT OF TRANSPORTATION

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