What is the smallest body classification car?

The smallest body classification car is known as a "kei car" or "microcar." Kei cars are a type of small vehicle that is popular in Japan and some other Asian countries, where space is limited and fuel efficiency is important. They are characterized by their compact size, with a maximum engine displacement of 660 cc and strict dimensions set by Japanese regulations. These regulations include length of up to 3.4 m (11.2 ft), width of up to 1.48 m (4.9 ft), and height of up to 2.00 m (6.6 ft). Kei cars often have unique design features to maximize interior space while adhering to these restrictions, making them popular for city driving and commuting.