The A4 motorway is a motorway in Romania that serves as a bypass for the city of Constanța, between Ovidiu and the Port of Constanța, connecting with the A2 motorway via an interchange southwest of the city. It is 22 km long and is planned to be extended to approximately 60 kilometers, stretching further south to the Bulgarian border south of Mangalia, along the western Black Sea coast. The motorway is part of an extension of the Pan-European Corridor IV, that will be connecting with the Bulgarian city of Varna.