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Here's a question about the Spanish roadnetwork.
About a decade ago, there were only a few Autopistas, in the north and the east (AP1,AP2, AP7, AP68etc), and all other roads were National roads. Since then, an enormous amount of Autovías were built, throughout the country, National road I - V were changed in autovías, but why became these roads autovías and not (tolled) autopistas?
thousands of kilometers of Autovías were built, but only several Autopistas (AP7, AP36). Why?
If you look at them, you can't see much difference between an Autovía and an Autopista.
thanks in advance.