If you say so. And good glad it's sorted.

The junction is called the Bowdon Interchange though? Also what's with the jagged bits that weren't there before?

It was set before actually, just such that when zooming out the bridges overlapped the roundabout. It tidies up the appearance of the junction. Think of it this way - the whole roundabout itself doesn't have motorway rules or restrictions, and the edge of the roundabout is the distinct line from which motorway rules apply (e.g. you're not allowed to go beyond that on foot).

Ok I can't read apparently

Valid point as to short-term closures. However I can't find a reference to six months no matter how much reading CtrlF-ing I do. Bit too authoritative of a tone to not have a specific citation, even if the figure is entirely reasonable.

Source on the 6 month figure?

The towns are divided by the Mersey - the historical divider between Lancashire and Cheshire. Yes they're the same borough, which is why I'm not trying to get a borough-level boundary. Yes they're unparished, but they're separate towns with distinct identities within the borough, and not just the same town as the current boundaries imply. (If you don't believe me ask any local.)

They're not signed IRL as Birchwood to Sankey Way, plus it's effectively longer. It's probably just there as a contingency in case of floods or closures so imo it doesn't make sense to have mapped here.