Kei cars are a category of small, lightweight vehicles in Japan, designed to meet specific regulations for size and engine capacity. They typically have a maximum length of 3.4 meters, a width of 1.48 meters, and an engine displacement of up to 660cc. These cars are popular for their compact size, making them ideal for navigating narrow streets and urban environments. Due to their small size, Kei cars often benefit from lower taxes and insurance costs, making them an economical choice for many drivers. They are available in various styles, including hatchbacks, vans, and trucks, catering to diverse needs while promoting fuel efficiency.