"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). Specific types of microcars include bubble cars, cycle cars, invacar, quadricycles and voiturettes, and the Japanese equivalent is the kei car.
Microcars are often covered by separate regulations to normal cars, having relaxed requirements for registration and licensing." - (en.wikipedia.org 28.07.2021)
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