The A2 (Portuguese: Autoestrada do Sul) is a major motorway (freeway) in Portugal.

It connects Lisbon, the political capital of Portugal, and the 25 de Abril Bridge to Albufeira in Algarve, the country's southernmost mainland province.

It extends for fractionally more than 240 km (149 miles).

The A2 is operated by Brisa - Auto-estradas de Portugal.

A trip from Lisbon to Albufeira using the A2 costs €20.85[1] Sections of the road carry very little traffic.