Car classification

Car classification is subjective since many vehicles fall into multiple categories or do not fit well into any. Not all car types are common in all countries and names for the same vehicle can differ by region. Furthermore, some descriptions may be interpreted differently in different places.

Broadly speaking, there are a set of classifications which are widely understood in North America, and another set which are somewhat understood in English-speaking contexts in Europe. Some terms borrowed from non-English languages may have different meanings when used in their native language.

Car show class definitions. A different classification system is used for purposes of differentiating vehicles in most car shows. While there is little doubt about the definition of classes that are self-described such as "Mustang" or "Firebird", there is often confusion about the definition of classes that are not as readily understood. The following classes are often used in car shows across America - the definitions are determined either by state regulations, the National Street Rod Association, or have been gathered from other reliable sources:

Classic car —A motor vehicle, but not a reproduction thereof, at least 30 years old, not materially altered or modified by the removal, addition or substitution of essential parts except that such parts represent the original
Hot Rod - Any car rebuilt or modified for higher speed, faster acceleration, or a sportier look. Many automobiles may be called hot rods, including some used in drag racing. They may be composed of used or newly fabricated parts. Can be a kit car.

Custom car - a factory-built vehicle that has been modified in either to improve its performance, often by altering or replacing the engine and transmission, or it may be a personal design by the builder, making the car look unique and unlike any car that might have been factory built. Though distinct from hot rods there is debate among customizers and rodders as to where the line should be drawn. A Custom Car cannot be a kit car, as a kit car is not a factory-built vehicle that has been modified from the original configuration.  Antique car — A motor vehicle, but not a reproduction thereof, at least 25 years old, which has been maintained in or restored to a condition which is substantially in conformity with manufacturer specifications and appearance.

Special Interest - a vehicle uniquely distinguishable from the usual, or designed for a particular purpose (i.e. fire truck, MASH jeep, tank, surf wagon, bus, race cars etc.) which would pique the interest of the public at large because of its uniqueness or specialty function.  Kit car - any vehicle that is created primarily from kit or prefabricated parts, and is a reproduction or replica. An original factory-built vehicle that utilizes prefabricated fiberglass body units to replace worn or damaged original parts is not a kit car.

(from Wikipedia - The Free Encyclopedia)