Claim: Japanese Kei cars are the smallest highway-legal passenger cars, created by the Japanese government in 1949 and are one type of microcar, which are generally known as a small fuel-efficient automobile, which can have three or four wheels.
Evidence: The kei car category was created by the Japanese government in 1949, and the regulations have been revised several times since. Kei car (or keijidōsha 軽自動車, "light automobile", pronounced [keːdʑidoːɕa), known variously outside Japan as Japanese city car, ultramini, or Japanese microcar, is the Japanese vehicle category for the smallest highway-legal passenger cars. Microcar is a term often used for the smallest size of cars, with three or four wheels and often an engine smaller than 700 cc (43 cu in).