If Buses themselves, were quiet places (like sitting peacefully in a nice garden or something) and thus other noise, disturbed my otherwise peaceful ride, I might sympathise. But merely riding on a bus, is to expose oneself to an enormous racket in the first place! Even when there is no-one else on board, it's an almighty case of noise pollution. They grumble and rumble, they rattle, they squeak, the engines make an awful noise. Even traffic on the road outside the bus, makes miles more noise than anything on the bus itself. Can't see the point in selectively zooming in on a few minor additions to all the usual racket tbh ;-)