• February 23rd, 2022

The Crash Investigation Sampling System provides a comprehensive national traffic crash database. Data collection is accomplished at 32 geographical sites, called Primary Sampling Units. These data are weighted to represent all police-reported motor vehicle crashes occurring in the United States during the year involving passenger cars, light trucks, and light vans that were towed.

This manual and the NHTSA Field Crash Investigation 2020 Coding and Editing Manual are part of the primary documentation supporting the 2020 CISS data file.

Read the full report here.