Governments and private organizations have developed car classification schemes that are used for various purposes including regulation, description, and categorization of cars.
The International Standard ISO 3833-1977 Road vehicles – Types – Terms and definitions also defines terms for classifying cars.
The following table summarises the commonly used terms of market segments and legal classifications.
Microcar and Kei car
Microcars and their Japanese equivalent— kei cars— are the smallest category of automobile.
Microcars straddle the boundary between car and motorbike, and are often covered by separate regulations to normal cars, resulting in relaxed requirements for registration and licensing. Engine size is often or less, and microcars have three or four wheels.
Microcars are most popular in Europe, where they originated following World War II. The predecessors to micro cars are voiturettes and cycle cars. Kei cars have been used in Japan since 1949.
Examples of microcars and kei cars:
Honda Life
Smart ForTwo
Tata Nano
A-segment
The smallest category of vehicles that are registered as normal cars is called A-segment in Europe, or "city car" in Europe and the United States. The United States Environmental Protection Agency defines this category as "minicompact." However, this term is not widely used.
The equivalents of A-segment cars have been produced since the early 1920s. However, the category increased in popularity in the late 1950s when the original Fiat 500 and BMC Mini were released.
Examples of A-segment / city cars / minicompact cars:
Fiat 500
Hyundai i10
Toyota Aygo
B-segment Supermini and Subcompact car
The next larger category small cars is called B-segment Europe, supermini in the United Kingdom and subcompact in the United States.
The size of a subcompact car is defined by the United States Environmental Protection Agency (EPA), as having a combined interior and cargo volume of between . Since the EPA's smaller minicompact category is not as commonly used by the general public, A-segment cars are sometimes called subcompacts in the United States.
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