Many buses in the inner city both travel at low speeds and stop very frequently. Having to buckle/unbuckle a seat belt will take a lot of time. So there it‘s a trade off between speed, convenience, and security, but usually it’s not problematic thanks to slow speeds inside the city.
As soon as a bus enters a free way or any road where it has to go faster, this automatically means that it will not stop as frequently and that the speed is higher, making seat belts a very good option and usually required.
I remember post 9/11 an aviatrix of a Piper Navajo (light twin engine aircraft 7,000lb max, 8 passenger) made the analogy that an aircraft like hers being temporarily banned from flying made no sense. This is because a 757/767, with its weight and potential speed, was literally like comparing a city bus to a bicycle. Momentum = mass (velocity). A bus has a huge momentum compared to most things it could crash into. More mass = safer. Also a bus is very crashworthy
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