I love the Japanese Kei-car concept[0]. The government mandates maximum external dimensions and engine capacity for cars and maufacturers adapt. On the other h

I love the Japanese Kei-car concept[0]. The government mandates maximum external dimensions and engine capacity for cars and maufacturers adapt. On the other hand they are taxed less and thus a lot cheaper than "normal" cars. And when the car size is exactly known, cities can be designed to match. Every parking space is the correct size and streets are just wide enough, but not more. [0] https://en.wikipedia.org/wiki/Kei_car https://en.wikipedia.org/wiki/Kei_car