Macedonian Magistrale (A prefix) often have motorway standard but there are even some A roads through villages. I think tier 4 seems to be correct.
Regional roads (R prefix) are sometimes used for waypoint labels but there are exceptions where names are used. I couldn't find any R road signed and GSV is only partially available.
A2/A4Sko:i/c @
http://www.openstreetmap.org/?lat=42.032456&lon=21.485642