sentences:  It is the longest expressway in the Philippines.The 51 kilometer South Luzon Expressway or SLEx connecting Manila with Santo Tomas, Batangas.It is composed of two segments namely, the Osmeña Highway (formerly/also known by many as South Superhighway) which starts from Paco, Manila and continues until Alabang in Muntinlupa and the Alabang-Calamba-Santo Tomas Expressway, which is also known as the South Luzon Tollway (SLT), which comprises the Alabang to Santo Tomas, Batangas segment.