It's generally not acceptable to eat or drink on buses either. If you are carrying a small bottle of water or something similar, then it's a good idea to wait until the bus comes to a halt at a traffic light or bus stop, before taking a drink to mimimize the risk of spilling your drink on the seat or someone nearby.

As of 2026, the rules for eating on buses in Japan depend heavily on the type of service. On local city buses, eating is strongly discouraged and considered a breach of social etiquette (manners). These buses are often crowded, and the smell or mess of food is seen as a nuisance to fellow passengers. However, on long-distance highway buses or airport limousines, eating and drinking are generally permitted. These buses often feature seat-back tables and cup holders similar to the Shinkansen. Even when permitted, Japanese etiquette dictates that you should avoid "noisy" foods (like crunchy chips) or items with "strong odors" (like fast food or heavy garlic). Always take your trash with you, as most Japanese buses do not have bins on board. Drinking water or tea is universally acceptable on all transport types, provided it is done discreetly and without risk of spilling during the bus's frequent stops.