please take a look at Trikala at about 1:500m zoom, i think this is the proper way to do city roads;EO30 originally passed through city center, now you can use the ring road instead, this route can be primary with ref=EO30 and the old one to be secondary with old_ref, the same goes with EO6 bypassing Trikala, so there is no need for primaries in city center