49 C.F.R. § 561.5 – Definitions.

(a) Statutory definitions. All terms defined in section 30102 of the National Traffic and Motor Vehicle Safety Act (49 U.S.C. chapter 301, et seq.) are used in their statutory meaning.
(b) Motor vehicle safety standard definitions. All terms defined in 49 CFR part 571 are used as defined therein.
(c) Other definitions—
Emergency response guide means a document containing in-depth vehicle-specific information related to fire, submersion, leakage of fluids, towing, and storage of vehicles for first and second responders.
First responder means a person with specialized training such as a law enforcement officer, paramedic, emergency medical technician, and/or firefighter.
Rescue sheet means an abbreviated version of an emergency response guide that gives quick information about a vehicle's construction, intended for use by first and second responders at the scene of a crash.
Second responder means a worker who supports first responders by cleaning up a site, towing vehicles, and/or supporting services after an event requiring first responders.