There’s a lot of roads which have a center median which allow only one way traffic per side. Is there any reason why the roads aren’t split to begin with? Almost all the roads I know of that are known to be split are not.
I just tried playing with road splitting in my area (ellemere), and I think I caused a mess. Sorry in advance.
Splitting is bad. If you split a road that was working fine before, please put it back.
There’s a lengthy page in the wiki about when not to split a road… Which is pretty much always. You need to have a very wide road with a wide median to be improving the map by splitting.
And yet, you missed the most important guideline at the start of the section on splitting:
The trouble with the u-turn part of that specification is that we often see user reports for whenever they’re actually instructed. Nobody seems to like being told to do a u-turn.