Andalusia with the northwest area of the country, or the A-43 which will connect the western Extremadura region with the east of Spain. Beltways, city accesses and urban highways Most beltways, full or partial, have originated from the upgrading of one or several roads reaching the town to the autovía level, as the several variantes looping around the town were joined in a single beltway that received a new naming such as TO-20 or Z-40. The list below only contains roads that are recognized as autovías or autopistas for at least part of its length, thus disqualifying urban arteries with at-grade intersections or unrestricted direct access to the main lanes, which are better represented by the dual carriageway concept. *: under construction Regional-managed motorways The formation of the several Autonomous Communities in the early 1980s led to the transfer of many roads to the new regional authorities. Since then, several of those roads have been upgraded to motorway level in order to ensure the internal vertebration of the region, or to provide alternative high-capacity routes to those managed by the national government when those were inadequate or saturated. All of the old comarcal roads (C-nnn) comprising the secondary network were transferred to the Autonomous Communities, splitting them up as necessary; while the national roads (N-nnn) that formed the primary network were mostly kept by the State. The level of control each community has over its road network varies: the Basque Country and Navarre have received the titularity of nearly all roads in their territories, while in other communities the regional network coexists with and complements the national one. Whatever the extension of the road network under its control, all communities have full powers over naming and identification of their roads, provided no name conflicts with a national road or a regional road of a neighbouring community. Andalusia The regional highway network of Andalusia is very extensive, as the territory itself spans nearly a fifth of Spain. There are no special codes for identifying highways: upgraded roads usually keep their name and sign color (orange, green or yellow). However, confusion sometimes arises due to the fact that most regional roads start with the letter A (for Andalucía), which is also used by the national government for highways. *: planned/in construction Aragon The community of Aragon has only very recently started building its own highway network. The first span was opened to