Why should a driver be cautious about relying only on mirrors when backing a passenger vehicle, rather than also using a spotter if one is available?

Pick an answer

1. Backing a passenger vehicle presents no additional risk compared to backing an empty cargo vehicle
2. Spotters are useful only for cargo vehicles, never passenger vehicles
3. Mirrors alone always provide a complete view when backing any vehicle
4. Mirrors still leave blind spots that a spotter positioned correctly can help cover

Correct!

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