Interstate 1

Interstate 1 (I-1) is an north–south Interstate Highway on the West Coast of the Iberian Peninsula in Europe, running parallel to the Atlantic coast. It travels through the countries of Portugal and Spain, serving a couple of large cities on the Portuguese and Spanish West Coasts, including Lisbon, Porto, Vigo, and A Coruña. It is the only north–south Interstate Highway in Portugal and one out of the two Interstates (I-3) to cross the Portugal-Spain border directly north and south.

Portugal
Main article: Interstate 1 in Portugal

I-1 begins at I-10 at the southernmost areas of Portugal.

Auxiliary routes

 * Interstate 101 is a short spur Interstate Higwhay connecting downtown Vigo and I-1 in Spain.
 * Interstate 201 is a bypass route tracing around the city of Lisbon in Portugal.
 * Interstate 301 was planned as a connector for Porto's port and commercial district, but the intersection with I-1 was built as a partial clover. The road is currently signed as PT-301.
 * Interstate 401 is a bypass route running around Porto to the east in Portugal.
 * Interstate 601 was planned as a bypass route for the outer Lisbon metropolitan area.
 * Interstate 801 is a future bypass that will avoid the entirety of Porto's metropolitan area.