Why is it prohibited to leave a passenger vehicle running unattended with passengers still aboard in most circumstances?

Pick an answer

1. Leaving the vehicle unattended with passengers aboard is always completely safe, since the doors remain closed and the engine stays off
2. This restriction applies only during scheduled maintenance stops
3. An unattended vehicle with passengers aboard could pose a risk if something unexpected happens, such as unauthorized movement
4. This rule exists only to conserve fuel

Correct!

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