In the south of Portugal we find only two main highways: on the one hand, the Infante de Sagres section (Autoestrada do Algarve): A22 Monte Gordo-Lagos, and, on the other hand, the A22 road: Spain-Exit N125 / Montegordo. The first works through the electronic payment system and the second is SCUT or free. You have all the information in: «Maps of Portugal«.
You have all the information in: "Maps of Portugal".