The  A 4  is a Portuguese motorway with a length of 63 kilometres (39 miles), running from Matosinhos to Amarante, where it narrows to become an IP road, signed as  IP4 .

[1] In 2013 the highway was extended from Serra do Marão to Bragança and the Portugal–Spain border, where it connects to the N-122 road (Spain).

The extension will also include a bridge reaching a height above ground of 230 metres (750 feet).

Once extended the A4 will become Portugal's third-longest motorway, with a length of 223 km (139 mi).

[2] The Túnel do Marão is Portugal's longest road tunnel, 5.6 km (3.5 mi) long.