thank you for the answer.
As far as cycling along the coast is concerned I was actually suspecting that Portugal is a little bit of a mess.
Now, while cycling, I don't have internet with me, neither I do carry paper maps as I normally prefer to have preloaded on my Montana 600 as a minimum three maps of the place I’m visiting: osm maps, velomaps (that give altitude information as well) and one garmin original city navigator map. Then, having the possibility to quickly swap from one to the other one at a simple touch, I normally manage to find the good road.
Not always unfortunately: recently indeed I had either the bad experience to find myself on a motorway close to Budapest and another time in France trying to get out of Montceau-les-Mines!!!
Now, coming back to what is allowed and what is not, according to the official web site of Estradas de Portugal *
, my understanding is that only “Autoestradas” classified as “IP-Itinerario Principal” are strictly forbidden.
The other “Autoestradas” classified as “IC-Itinerario Complementar” are not forbidden to bicycles, though not very much recommended from a point of view related to “fun”.
... well, let me see, I'll try to be as much as careful I can
* Nos itinerários principais é proibida a circulação de peões, velocípedes e veículos de tracção animal.