Well, I mean the big brown km posts with white/green RA6 shield. Not the small black/white hectometer posts.
If memory serves, RA6 is not indicated anywhere on direction signs though. Just "Perugia".
And it has green motorway signs (autostrada), not blue motorway signs.
AGRA is also "green" (autostrada) and A90 is indicated on the brown km posts but AGRA is indicated on direction signs. It's fine too me but this route is in itaa system.
I think that RA6 should be autostrada (itaa system) too, not just eursf.