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In Japan, there is a vehicle market segment known as keijidosha (literally means light automobile) which is a category of small-sized cars that are designed to comply with Japanese government tax and insurance regulations. These Kei cars also have to comply with size and power regulations, in other words, their dimensions and horsepower must not exceed certain regulations.
Subaru R1, one of Subaru's recent Kei car models.
Currently, their dimensions can not exceed 3.4 metres in length, 1.48 metres in width and 2 metres in height. And engine specifications are limited to a maximum of 660cc for displacement and 63 brake horsepower. Kei cars are generally less popular outside of Japan and we don