Per Moving Ahead for Progress in the 21st Century (MAP-21) Act requirements, all States must report serious injuries resulting from motor vehicle crashes. Under the Federal Highway Administration’s (FHWA) Safety Performance Management Measures Final Rule (23 CFR 490) and the National Highway Traffic Safety Administration’s (NHTSA) Uniform Procedures for State Highway Safety Grants Program Interim Final Rule (23 CFR 1300), the United States Department of Transportation (US DOT) has established a single national definition for reporting serious injuries. States are required to adopt this definition by April 15, 2019. This will ensure consistent, coordinated, and comparable serious injury data. The attached FAQ outlines the definition, applicable guidance, and available technical assistance.