defined by the FMCSA federal laws https://www.fmcsa.dot.gov/regulations/title49/section/390.5. 49 C.F.R. § 390.5 definitions in Part 390.5 of the Rules and Regulations 49 CFR 390.5 49 CFR 390.5 49 CFR 390.5 https://www.fmcsa.dot.gov/regulations/title49/section/390.5 also includes 49 CFR 390.5 49 CFR 390.5 Code of Federal Regulations DOT recordable accidents 49 CFR 390.5 Rule 390.5 "FEDERAL MOTOR CARRIER SAFETY REGULATIONS; GENERAL"