Did you ever question whether you could do it?

CookieMonster:
One other thing worth mentioning. In the example you’ve given, you’re going to be doing a blindside reverse. Not too much of a problem in a rigid as you can still see all four corners of your vehicle in your mirrors. In an artic however, all you will see in your passenger side mirror would be your own trailer. This means if any car or pedestrian decides to go behind you, you won’t know anything about it until it’s too late.
It’s fine to do a blindside reverse if you’re backing on to a loading bay at an rdc, or parking space in a services or yard, but if you’re on a public road, or anywhere else you can encounter the idiots within the general public, then avoid blindside reversing unless you have someone to watch you back.

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So when faced with a situation where you have to blindside, I’m guessing it’s better to carry on driving and turn around somewhere so you’re reversing in on the other side.