From Madrid, take the N-1 toll road north to
Burgos, then follow A-1 to Miranda de Ebro. From here, continue on the A-68
north to Bilbao and then the A-8 east to San Sebastian. From Pamplona, take the
A-15 north to the N-1 route, which leads right into San Sebastian.
Donostia - San Sebastian is also linked by the highway A-8 in direction to Irun
where you get the A-63 till Paris.
From France, the A-8 reaches Bilbao where it is linked with the A-1 till Madrid.