Lots of drivers, when turning left, will move to the right, to the centre of the road, then turn left. They will do the opposite when turning right. Why?
If you are referring to an to an Articulated HGV, if the driver turned on the turning, the trailer will either hit a Building, mount the pavement, Knock down Kerb Edge Barriers, the overall lenghth of an artic is app 65 Ft, some are longer depending on the trailer.
If I know that the road I'm turning into to the left is narrow I always position the vehicle wider to the right than normal to avoid hitting a vehicle emerging from that turning. Not when turning right though as there's normally more room to swing around.
I have often wondered the same. It makes no sense. Back in the 50's, when pavement corners were sharp, it was necessary. But most of them were not about then.