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Kei cars, also known as Kei jidosha or K-cars, are a unique category of small vehicles that are popular in Japan. These vehicles have a specific set of regulations and characteristics that make them distinct from regular cars. Here are some key points about Kei cars in Japan:

Size and Dimensions: Kei cars are small in size, with strict regulations governing their dimensions. As of my last update in September 2021, the maximum dimensions for a Kei car are typically 3.4 meters in length, 1.48 meters in width, and 2 meters in height.

Engine Size: Kei cars are limited in engine displacement size, typically having engines with a capacity of 660cc or less. The engine's power output is also limited to around 63 horsepower (47 kW).

Tax and Insurance Benefits: In Japan, Kei cars enjoy certain tax and insurance benefits, which make them an attractive option for buyers. These benefits can result in lower ownership costs.

Fuel Efficiency: Kei cars are known for their fuel efficiency, making them a practical choice for urban driving. Their smaller engines contribute to their excellent mileage.

Classification: Kei cars are classified into different categories, including regular passenger cars, microvans, and trucks. There are also sportier Kei cars designed for enthusiasts.

Design and Functionality: Despite their small size, Kei cars are designed to maximize interior space and functionality. They often feature innovative interior layouts to make the most of the limited space.

Popularity: Kei cars are incredibly popular in Japan, especially in crowded urban areas where their small size and easy maneuverability are advantageous. They are also popular among older drivers.

Safety: Manufacturers of Kei cars prioritize safety, and modern Kei cars often come equipped with safety features such as airbags and stability control.

Electric and Hybrid Kei Cars: In recent years, there has been a growing interest in electric and hybrid Kei cars as a more environmentally friendly alternative.

Cultural Significance: Kei cars have cultural significance in Japan and are often seen as a symbol of practicality and efficiency. They are a part of Japan's automotive heritage.