Passenger Car

Motor vehicles used primarily for carrying passengers, including convertibles, sedans, and station wagons. (NHTSA3)

Any motor vehicle that is an automobile, auto-based pickup, large limousine, or three-wheel automobile or automobile derivative. (NHTSA2)

Any motor vehicle that is a convertible; 2-door sedan, hardtop, or coupe; a 4-door sedan or hardtop; a 3-or 5-door hatchback coupe; an automobile with pickup body; or station wagon. (NHTSA1) 

A motor vehicle with motive power, except a multipurpose passenger vehicle, motorcycle, or trailer, designed for carrying 10 persons or less. (49CFR571)

A unit of rolling equipment intended to provide transportation for members of the general public, including self-propelled cars designed to carry baggage, mail, express and passengers. (49CFR223)