The South Luzon Expressway (SLEX), signed as E2 of the Philippine expressway network and R-3 of the Metro Manila arterial road network, is a limited-access toll expressway that connects Metro Manila to the provinces in the Calabarzon region on the island of Luzon in the Philippines. The expressway has a length of , traveling from its northern terminus at the Magallanes Interchange in Makati to its southern terminus at Santo Tomas, Batangas, connecting it to the Southern Tagalog Arterial Road. A portion of the expressway from the Magallanes Interchange to the Calamba Exit is part of Asian Highway 26 of the Asian highway network. The expressway also serves as a major utility corridor, carrying various high voltage overhead power lines and an oil pipeline. Notable power lines using the expressway's right of way for most or part of their route are the Sucat–Paco–Araneta–Balintawak transmission line, and the Biñan–Calamba and Calamba–Bay lines. The Magallanes–Alabang section of the expressway was also used to carry the Batangas–Pandacan oil pipeline. The South Luzon Expressway was built during the late 1960s as part of the government's plan to develop the areas adjacent to Metro Manila, with SLEX serving the south. The expressway was originally controlled by the Philippine National Construction Corporation (PNCC), until the expressway's operations and maintenance was transferred on May 2, 2010, to the South Luzon Tollways Corporation (SLTC) and Manila Toll Expressway Systems (MATES). Originally stretching from Magallanes, Makati to Alabang, Muntinlupa, it was extended in the late 1970s towards Calamba, Laguna at the south. In 1995, the expressway's Magallanes–Alabang section began to be rehabilitated and became part of the Skyway System as its at-grade section, as the elevated Skyway was being built above it up to Bicutan. From 2006 to 2009, the expressway underwent rehabilitation which modernized the road and its facilities, expanding the Alabang Viaduct as well as the section from Alabang to Calamba and connecting it to the Southern Tagalog Arterial Road in Santo Tomas, Batangas by June 2010. Route description The South Luzon Expressway cuts southwards from Manila up to the provinces in Calabarzon. The expressway consists of two sections. The first is a segment of SLEX underneath the Skyway from Magallanes Interchange in Makati to Alabang Exit in Muntinlupa, called the Skyway At-Grade. The remaining segment from Alabang to Santo Tomas, Batangas is part of the South Luzon Tollway segment, also called the Alabang–Calamba–Santo Tomas Expressway (ACTEX).