first of all, there is already a topic about this: “Κατηγορίες δρόμων” and a conversation before that in topic “consensus about road classification” and i dont understand why you made a new one…
second, there is a complete classification system i made some time ago: http://wiki.openstreetmap.org/wiki/Roads_in_Greece and that’s the one we need to discuss
i never suggested to map for the navigation software, you just asked me what the voice command says when there is no ref…so 2a is out
i understand there are official documents about road classification (in a country like Germany or UK that should be enough, because there is an organized scheme backed by the state and updated regularly)
in our case these documents are outdated, forgotten and far from reality (there are major roads missing, old provincial roads have become urban highways, or they lead to villages, on the mountains, some are not even paved)…for all these reasons i think road numbering should only be secondary info (nat_ref/reg_ref)
national highways connecting something other than cities or other major destinations, should not be named Εθνική Οδός and should not be primary
i only care to represent reality (in real life road names are based on destinations…a primary road connecting 2 cities is called Εθνική Οδός Θεσσαλονίκης - Φλώρινας, not EO2)
i dont care about the condition of the road (exception:very poor quality roads, without lines of even asphalt)
about EO44: section Thiva - Chalkida should be primary (they both have population over 10000) and named Εθνική Οδός Θήβας - Χαλκίδας…section Chalkida - Lepoura should be secondary because connects Chalkida to towns like Eretria, Aliveri, Kymi and Karystos (all over 2000) and named Επαρχιακή Οδός Χαλκίδας - Ερέτριας, or simple Χαλκίδας - Ερέτριας κτλ
i think this is the best depiction of reality…a driver leaving Chalkida would know his destination simply by road type (when on primary road he ends up in a city, when in secondary he goes to a town)
sorry for the long post i just needed to state my case