The National Highway Traffic Safety Administration (NHTSA) Office of Vehicle Safety Research, in conjunction with the Research and Special Programs Administration Volpe National Transportation Systems Center (Volpe Center), is conducting separate analyses of major vehicular crashes in support of the Intelligent Vehicle Initiative (IVI). The IVI is focused on solving traffic safety problems through development and deployment of vehicle-based and vehicle-infrastructure cooperative countermeasure systems that address rear-end, roadway departure, lane change, crossing paths, driver impairment, reduced visibility, and vehicle instability crashes. Research in these crash problem areas is being conducted in the context of four vehicle platforms including light, commercial, transit, and specialty vehicles (e.g., emergency vehicles, snowplows, etc.).