The mythical Nacional 2. The biggest road in Portugal, going from north to south. A MUST in every bikers bucket list!
Starts with lots of curvy nice roads up until km500 where it transforms into nice, plain, cruiser style straights. In the last 50km it turns to the mountain with the BEST road in portugal!!!
I advise 2 days at least, as its average speed is not very high (70km/h).
Lot that many traffic as its a back road