Hi SekeRob.
During my QA sessions I see a lot of long running route relations that are broken at an impossible level, so I do my best to put them back in shape.

In this case I didn't make a local survey, but I based my edit on public available information on ANAS web site. In this case SS5 formally stops at RA12 intersection which, by the way, is the place where you find the Chieti sign as per Mapillary images (ANAS, as a general rule, doesn't manage highways that are inside a "centro abitato" with a population greater that 10.000 people).
I would also say that locally posted signs about highway refs are usually not promptly adapted when the formal classification changes, so it could be difficult to say what's really authoritative.
Anyway... since as I presume, looking at your edits area, that you have local knowledge about the current configuration of SS5 in Chieti/Pescara, I will be more than happy to modify the relation based on your input.

Thanks

IlBano