Western Australia · Theory Test (CTT) · Road rules

Why does an unrestrained occupant get injured in a crash at 100 km/h?

The answer

  • The doors open on impact
  • The vehicle stops but their body keeps moving at that speed Correct
  • The airbag pushes them forward
  • The seat collapses backwards

Why that's the answer

If you are travelling at 100 km/h on impact, your body will still be moving at that speed — the 'human collision' that happens after the vehicle has stopped. That is what a seat belt prevents.

Where this rule comes from

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