why is it easier for people with motion sickness to sit facing the opposite direction in a train but not in a bus?

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why is it easier for people with motion sickness to sit facing the opposite direction in a train but not in a bus?

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Roads are far less even and straight than train tracks are so buses end up making a lot more side-to-side and up-and-down movement than trains do. Motion sickness is thought to be caused when the inner ear (which senses acceleration) sends signals to the brain which don’t match the visual signals received – so like if you’re on a bus and mostly feeling side-to-side movements as the bus rounds curves but you’re facing backwards so you’re not anticipating them visually, motion sickness could result from that. On a train most of the visual information you can get by looking out the windows is going to match what you’re feeling as the acceleration and deceleration is far more regular

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