Why do we get car sickness?
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In simple terms, it’s all to do with the lack of control. You can make all the same movements when you’re driving the car yourself and not feel sick at all because you’re *expecting them*. Your brain knows what you’re doing and what’s happening.
When someone else is in control, you can’t anticipate their movements and, if there’s a lot of changes of speed, it messes with your balance and confuses your brain. It doesn’t know how to react as the movement is unnatural.
Cars and moving at those speeds (with such frequent movements and changes in speed) isn’t a natural thing, so our brains don’t always react to them properly. Unfortunately, as already mentioned by someone else, the brain thinks up the only ‘reasonable’ possibility it can come up with which is “*Gasp* Poison! Evacuate everything in the stomach, we’re in danger!”.
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