In order to produce a national traffic accident data base for the evaluation of old and the development of new highway and vehicle safety standards and to identify highway safety needs, the National Accident Sampling System (NASS) was created. The system consists of twenty-four teams of accident researchers situated throughout the country. At each Primary Sampling Unit (PSU) site the accident research team investigates a probability sample of police reported accidents involving passenger cars, light trucks, and vans which were towed, according to the police report, from the scene due to damage. This system has been termed the Crashworthiness Data System (CDS). Zone centers have been established to provide for the quality control of the CDS data collected and the technical management of the teams within their zone. Quality control is carried out through zone center site visits to the PSU's and through the review of accident case report materials received at the zone center. The zone centers provide quality control in the areas of sampling, completeness of data, reliability, and validity of data. In addition, the zone centers provide annual team evaluations, training, extra PSU staff (when needed), and act as a communication link between the PSU teams and the staff of the National Center for Statistics and Analysis (NCSA). The purpose of this manual is to provide PSU team members, zone centers, the Transportation Safety Institute (TSI) NASS Training Program Coordinator, and NCSA with a consistent, standardized set of instructions for sampling accidents and collecting, coding, and editing the data.


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