It changes surface type - the Queensferry Rd end is dirt, the twisty bit at Masterton Rd is asphalt. I am not sure where the transition is as I have not surveyed the whole length in person, so it will need a revisit.

Those are indeed flats numbered 50A, 50B etc. as per your example in all three buildings. Can you clarify why did you just delete this without checking in first?

Thanks - I have noticed there is a lot of that going on in North Queensferry as I was trying to reconcile buildings on East Bay. Have you worked out a reasonable offset to work with?