now, in the picture below, i will demolish the tile seen in green.
Now this is the result below.
i have also plopped two RHW4 starter pieces heading in their appropriate direction.
IMPORTANT: NOTICE THE TWO SINGLE RHW TILES ON THE LEFT OF THE CURVE.
these two tiles are crucial for re-establishing the RHW system.
in the picture below i have connected the starter pieces with the RHW2 sharp-curves.
now i have a functional RHW4 system. (notice the two RHW tiles, mentioned above, still remain.)
now here i have demolished the 'single-click' road tiles (included the two RHW tiles)
i am left with a functional RHW4 sharp curve transition.
at this stage you should be able to plop the 'double curve' over-top the existing system.
..as seen below.
final smooth-curved system.
NOW, if you delete an part of the RHW and end up with this:
the next three (PICs) will show a conceptual way of fixing this problem. it is not the easiest way. it demonstrates a basic concept that will become increasingly relevent when building on sloped terrain and building interchanges. stay tuned for those entries.
REFER back to (PIC3) now.
see where the green highlighted tile is? demolish it.
after you demolish that tile (as seen above) demolish the two tiles that are noted in (PIC3)
now with single clicks (and single clicks only!) of the draggable RHW, tap the two tiles where the RHW2 meets the RHW4.
(NOTE: the pic below only shows the first "tap")
now you should be at the same stage depicted in (PIC6)
BONUS TEASER PIC: