Historic or special interest vehicle: a vehicle of age which is essentially unaltered from the original manufacturer's specifications and which, because of its significance, is being collected, preserved, restored, or maintained by a hobbyist as a leisure pursuit.

Parts car: a motor vehicle generally in nonoperable condition which is owned by a collector to furnish parts that are usually not obtainable from normal sources, thus enabling a collector to preserve, restore, and maintain a vehicle of historic or special interest.

Street rod: any modified antique automobile or truck produced by an American manufacturer in 1948 or earlier which has undergone some type of modification, including the modernization of the engine, transmission, drivetrain, interior refinements, and other modifications the builder may desire, which vehicle is to be driven under its own power and is to be used as a safe, nonracing vehicle for family enjoyment.