The Autopista A3, also known as Autopista Havana-Melena, is a Cuban motorway linking Havana to Melena del Sur. It is a toll-free road and has a length of . Although it's a part of the Cuban motorway system, it only has one official interchange with the San José de las Lajas-Bejucal Road (2-376), and an unofficial unpaved interchange with the Calle 100 (2-400) of Havana, with the rest of the junctions being at-grade. It also turns into an undivided 2 lane highway after the junction with the Road of Batabano.
The A3 is a dual carriageway with 4 lanes and has some at-grade intersections with rural roads. It starts in Havana, from an interchange of the Havana Beltway (A2), and continues through Mayabeque Province; crossing the western side of the municipality of San José de las Lajas, and ending on a provincial highway, 2 km west of Melena del Sur.