If you have noticed, long distance busses tend to have seatbelts.
But the reason is simple: Busses are heavy and big, they tend to be the victors in a collision.
Busses never really get to accelerate to significant speeds where belts would actually bring much use, on the account them usually stopping every few minutes and being in traffic.
Busses need to by design vehicles that are easy to get in and out of, the time fiddling with belts brings would decrease efficiency. In reality the best bus would be one without seats at all.
The kind of emergencies that an average city bus would get in to are the kind where seatbelts being more danger than benefit. There aren’t really many vehicles heavier than a bus that could collide to a bus in normal operation. However in a fire, which is a more likely and deadly emergency for a bus you need to evacuate the bus quickly; and having belts makes this harder.
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