A4 (Portugal)
The A 4 is a portuguese Motorway which runs from Matosinhos to Amarante, with a length of 63 km, where it narrows to become signed as the IP road of which, by now, forms a part, IP4 . The motorway leaves the metropolitan area of Porto, through the urban areas of Ermesinde, Valongo, Paredes, Penafiel, until arriving at the mountainous town of Amarante