While there is no formal law strictly prohibiting eating in a Japanese taxi, it is generally considered bad manners (man'er) and is strongly discouraged. Japanese taxis are famous for their immaculate cleanliness, white-gloved drivers, and automatic doors; the driver takes great pride in maintaining a pristine vehicle for every passenger. Eating messy foods, snacks that leave crumbs, or items with a strong odor is seen as disrespectful to the driver and the next guest. If you are extremely hungry, a small, discreet piece of candy or a quick sip of water is usually acceptable, but you should avoid "full meals" or open containers of food. If you must eat, it is polite to ask the driver, "Shokuji shite mo ii desu ka?" (Is it okay to eat?), though you should be prepared for a polite but firm decline. In 2026, with the high standards of hospitality in Tokyo and Kyoto, following these unwritten rules is a key part of "traveling like a local" and showing appreciation for the world-class service provided by Japan's taxi industry.