From: A-50 Salamanca Length 3.5 km | To: A-66 Salamanca Province Province of Salamanca | |
The Autovía SA-20 is a highway of approximately 3,5 kilometers in central Spain between Autovía A-50 and Autovía A-66.
Map of SA-20, Salamanca, Spain
Because it is not the doubling of the N501 it replaces, it is build as a new road, so you can not value it as an upgrade of the N501.
References
Autovía SA-20 Wikipedia(Text) CC BY-SA