South Luzon Expressway

The South Luzon Expressway (SLE or SLEX, name used from 1976 to the present), which is formerly called the South Superhighway (SSH) and Manila South Expressway (MSEX, name used from 1969 until 1976), and officially known as Radial Road 3 or R-3, is a network of two expressways that connects Metro Manila to the provinces of the CALABARZON region in the Philippines. The first expressway is the Metro Manila Skyway System, operated jointly by the Skyway Operation and Management Corporation (SomCo) and Citra Metro Manila Tollways Corporation (CMMTC). The second expressway, the South Luzon Tollway or Alabang-Calamba-Sto.Tomas Expressway (ACTEX), is jointly operated by the South Luzon Tollway Corporation, a joint venture of the PNCC and the SMC-backed Citra group of Indonesia (the group where MTD Capital Berhad, the original partner, sold their shares) via the Manila Toll Expressway Systems, Inc. (MATES).

The expressway starts in Manila's Paco District at President Elpidio Quirino Avenue and passes through the following cities and municipalities: Manila, Makati, Pasay, Parañaque, Taguig and Muntinlupa in Metro Manila, San Pedro, Biñan City, Carmona in Cavite, the transverses again to Biñan City, Santa Rosa City, Cabuyao City and Calamba City in Laguna it ends in Santo Tomas, Batangas.

In 2006, the South Luzon Tollway segment underwent rehabilitation through the SLEX Upgrading and Rehabilitation Project, which rehabilitates and expands the Alabang Viaduct as well as the road from Alabang to Calamba, and eventually connect the expressway to the Southern Tagalog Arterial Road to Santo Tomas, Batangas.