I don't consider it rude, especially if you're taking a long trip that is extended over your normal meal times. Many people will pack a lunch to take with them on a trip like this. I think it is important to pack foods that aren't bad smelling, like eggs, fish, or onions, so you don't offend your fellow passengers.

In 2026, the politeness of eating on a bus is generally determined by smell, mess, and noise. While eating is not strictly "forbidden" on many transit systems unless posted, it is widely considered rude to consume "smelly" foods like fast food, fermented items, or fish in a confined space where other passengers are trapped with the aroma. Small, "clean" snacks like a granola bar, a piece of fruit, or chocolate are usually seen as acceptable, especially for commuters who may not have had time for a meal. However, "loud" eating—such as crinkling plastic wrappers or loud crunching—can be annoying in a quiet environment. The "golden rule" of bus etiquette is to ensure you leave no trace; leaving crumbs, bones, or trash on the seat is a major social faux pas. In some cities like Singapore or Washington D.C., eating on the bus can actually result in a hefty fine, so it is always best to check the local transit authority's "Code of Conduct" before tucking into a sandwich.