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    1. Maybe so you can see if someone parked behind you before you open the doors from the inside.

    2. Probably to see if something fell over and is about to fall out (and onto you) when you open the doors.

    3. Anagittigana on

      The driver can look back and see if there is anything directly behind them at ground level. It’s an older measure to address the blind spot behind the truck from before backup cameras became ubiquitous.

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