The Autopista A4, also known as Autopista Este-Oeste or Autopista Nacional Este-Oeste, is a Cuban motorway linking Havana to Pinar del Río. It is a toll-free road and has a length of 156 km (97 mi). Along with the Autopista A1 (Autopista Nacional), partly built, that will link Havana to Guantánamo, it is classified as part of the whole Autopista Nacional route, spanning the length of the island; as the Carretera Central highway.