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            In This Section
        Safety Data Analysis & Tools
                Crash Modification Factor Clearinghouse
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                Crash Investigation Sampling System (CISS)
**Description:**
        The Crash Investigation Sampling System (CISS) has detailed data on a representative, random sample of thousands of minor, serious, and fatal crashes. Approximately 4,000-4,500 cases are studied annually by trained crash investigators from 24 Primary Sampling Units (PSUs) in 18 states. These PSUs target late model year vehicles and injury crashes. Additional sites, and special studies such as pedestrian, motorcycles, and trucks, may be added in the future.
Investigators study evidence from the scene (e.g., skid marks or damaged guardrails), measure damage sustained by vehicles, identify interior locations that were struck by occupants, interview crash victims, and review medical records to determine the nature and severity of injuries. Crashes included in this dataset involve at least one passenger car towed from the crash scene.
The database includes data not typically found in police crash reports (e.g., information from medical records). Personal information, including specific crash locations are not included in the CDS data files. Data must pass quality control standards built into the data collection cycle before being approved for inclusion in the database.
The CISS replaces the National Automotive Sampling System Crashworthiness Data System (NASS CDS), with the CDS ending in 2015 and CISS beginning with 2016 crash records.
    
          **Tool Type:**
        Database
    
    
    
          **Owner Source:**
        federal
    
          **Sponsor/Owner:**
        National Highway Traffic Safety Administration (NHTSA)
    
        **Published:**
      2014
    
        **Availability:**
      For statistical publications and information, or data files, contact:
National Highway Traffic Safety Administration
National Center for Statistics and Analysis
Data Reporting and Information Division, NVS-424
1200 New Jersey Avenue SE.
Washington, DC 20590
1-800-934-8517ncsaweb@dot.gov
Or visit Crash Investigation Sampling System.
    
          **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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