In general, people prefer to face the direction they are travelling. A lot of people have issues with moving backwards, especially with the frequent start/stops in a motor vehicle (as opposed to the smoother train rides).
Besides that, the rear passengers usually aren’t the ones at risk in motor vehicle accidents. They typically don’t have any protection other than their seat belt. If you’re referring to the front passenger, that would mean turning the seat around, which prevents the passenger from seeing in front – they might not need to, but they would certainly want to, and often is required to assist the driver in navigating. Plus, the reverse seat would block the sight lines of the driver.
There is a balance to achieve between safety in comfort. People will accept a certain level of safety until it become uncomfortable. If people had to sit backward in car, they would more than likely cross the comfort threshold for many, and they would simply stop riding in cars, or refuse to buy cars with such seats. Would more people survive accident? Probably, but it would also cost the industry too much. It is similar to five point seat belts. They would no doubt save many more lives. However, people would probably be less likely to wear them. The best engineered device in the world is useless if people don’t want to use it.
The brain tells the body what movement to expect – the anticipated lurching forward at a sudden stop, bracing yourself when you see a pothole you can’t avoid, the sideways body roll on a sharp turn, etc.
If you’re not seeing the road, your brain doesn’t know what to expect – which results in motion sickness
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