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The South Luzon Expressway (SLEX) is a tollway that connects Metro Manila to the provinces of the CALABARZON region in the Philippines. The expressway starts from the Alabang Viaduct in Muntinlupa City to Santo Tomas in Batangas. It is the part of the South Luzon Tollway network, which includes the Metro Manila Skyway and the Southern Tagalog Arterial Road.

The expressway was built from 1967 to 1969 as the Manila South Expressway by the Construction and Development Corporation of the Philippines (now the Philippine National Construction Corporation) and was opened on December 16, 1969. In 1977, Presidential Decree No. 1133 granted CDCP a franchise to build and operate for a thirty year period from May 1, 1977 to April 30, 2007.

The expressway initially stretched from Makati City to Alabang in Muntinlupa, which was followed by a 29 kilometer extension to Calamba, Laguna in 1976. In 1997, As a result of the Metro Manila Skyway project, the expressway was split into two segments, with the Skyway System taking over the segment from Nichols Field in Pasay City to Alabang.

In 2006, the expressway 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 in Batangas. Part of the project is a 55.87 km extension which would connect the Calamba-Santo Tomas segment to Lucena City in Quezon.

The operating concession was transferred to the South Luzon Tollway Corporation (SLTC) in 2007 upon the expiry of PNCC's franchise. The SLTC is a joint venture between the PNCC and MTD Manila Expressways, a subsidiary of MTD Capital Berhad of Malaysia. Tollway operation is handled by Manila Toll Expressway Systems, the operation and management arm of SLTC.