Very nice road.
The section between Aveiro and Ãgueda Its very poor, bad tarmac, some traffic and the scenery isnt very good. But after some 5 kms of Ãgueda the tarmac becomes spectacular, no traffic, great corners with a great scenery.
Route 103 in Northern Portugal runs from Braga in the West to Braganca in the East. About 200 kilometres of absolutely stunning mountain road. Traffic is generally light and the road surface, by and large, is excellent. Chaves, about half way, makes a nice stop off point and the opportunity to refuel self and bike. The western section is largely fast, open sweepers, the eastern has a lot more tight and twisty stuff. Ride it, you'll love it!