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While you, a highly trained UPS driver, and I knew what I meant, what was posted, esp to a new rookie, was totally wrong. And I applaud him for catching the miscommunication.
Backing should only be done when needed, and it is much less needed than many drivers think. And when you do need to back, do so while you are arriving at the stop, not after you made the stop and are leaving. Back while you are fresh with the surroundings and you have the drivers perspective. Once you leave your vehicle, you no longer have the knowledge of what is around you or your vehicle. you might think you do, but you really dont.
Rules for backing. Avoid when ever you can. IF you must back, back first, in other words to where your car is ready to move forward when you start out again.
Always use your horn when backing, check mirrors, and rear view cam, but use mirrors for backing, using the cam only to check what might be right behind you.
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