Hi,
Will you ride from England to Spain?
I live in Guimarães (North of Portugal) and when I ride to Salamanca (if I want fast trip) I usually go towards Vila Real, Bragança (border with Spain) and then Zamora. From Zamora to Salamanca is around 60 Km.
For beautiful ride but much more time, Guimarães - Vila Pouca de Aguiar (national road N206) than Carrazeda de Ansiães, Miranda do Douro (border with Spain) Torregamones and then Salamanca.
Honestly I prefer interior roads, but you'll take much more time (maybe more 3 hours than highway)
View attachment 68047
Ride safe.
Best Regards,
Nuno Fernandes