Hi IlBano,

Sadly, back to the original, no consensus, of what the Via Tiburtina Valeria / SS5 is on OSM and what continues to be absent as a historical route relation on the OSM system for the full stretch of 214km as pictured in the same wiki

https://it.wikipedia.org/wiki/it:Strada%20statale%205%20Via%20Tiburtina%20Valeria?uselang=en#/media/File:Strada_statale_5.png

and this which happily continues to reference the SR5 exSS5, the ref=SR5 which sticks out including smack in the middle of > 10000 inhabitants areas.

https://percorsostrada.it/strada-regionale/sr5-exss5/

I'll sleeps on this a bit more.

cheers