sentences:  Spanish toll roads (or "autopistas") are designated AP-XX (where XX is the number of the road) as opposed to State-maintained dual carriage-ways (or "autovías"), called A-XX.Most of them are networked, so a ticket is issued on entering and the fee is paid when leaving the road.Technically, all the roads belong to the Government, although autopistas are built and maintained by private companies under a State concession; when the concession expires, the road reverts to State ownership, although most of them are renewed.