Sometimes you have to climb a mountain pass even in a main road, autovía or national road. These are called "Puertos de montaña" (mountain ports) in Spanish. Sometimes there's a tunnel, sometimes not, if you check the Spanish wikipedia pages of the different roads you can get access to the different elements that you can find in any major Spanish road (mountain passes, tunnels, junctions, exits...). Here's a quick recollection:
A-1 Autovía del Norte:
Puerto de Somosierra (1444m) around km 95-100.
A2-AP2 Autovía del Nordeste:
Puerto de Alcolea (1218m) around km 135-140
Puerto del Frasno (770m) Around km 250
Puerto de Morata (680m) + tunnel, around km 255-260.
A-30, Autovía de Murcia:
Puerto de la Cadena (358m) after leaving Murcia southbound.
A-5 Autovía del Oeste
-Puerto de Miravete (624m), km 207
A-6 Autovía del Noroeste
-Puerto de Guadarrama (1511m), between km55-60
-Puerto de Piedrafita de Cebreiro/Piedrafita do Cebreiro (1099m), km431
-Puerto de la Mora A-92,
https://goo.gl/maps/QNxwGcZmfRU7w8xD7
A-4 Autovía del Sur
-Paso de Despeñaperros (Located in the Natural Park of the same name):
https://www.google.com/maps/place/Parqu ... 1026?hl=es
