Accident means an occurrence associated with the operation of a vehicle, if as a result:
(1) An individual dies; or
(2) An individual suffers bodily injury and immediately receives medical treatment away from the scene of the accident; or
(3) With respect to an occurrence in which the mass transit vehicle involved is a bus, electric bus, van, or automobile, one or more vehicles (including non-FTA funded vehicles) incurs disabling damage as the result of the occurrence and such vehicle or vehicles are transported away from the scene by a tow truck or other vehicle; or
(4) With respect to an occurrence in which the public transportation vehicle involved is a rail car, trolley car, trolley bus, or vessel, the public transportation vehicle is removed from operation.
49 CFR § 655.4
For this part, the terms listed in this section have the following definitions. The definitions of additional terms used in this part but not listed in this section can be found in 49 CFR Part 40.