Microcars, also known as Kei cars in Japan, are the smallest and most compact cars you can drive. Microcars were designed for dense city environments, which is where they are also known as city cars. Though they usually having four-wheels, some microcars have a three-wheel configuration with either a 500-800 cc engine or an electric motor. The world first saw the A-segment class car in the United Kingdom after World War II, as people who wanted a microcar for better gas mileage and a smaller size to fit into dense parking spaces in major cities.