Subic–Clark–Tarlac Expressway

The Subic–Clark–Tarlac Expressway (SCTEX), signed as E1 and E4 of the Philippine expressway network and R-8 of the Metro Manila arterial road network, is controlled-access toll expressway in the Central Luzon region of the Philippines. From its northern terminus in Tarlac City to its southern terminus at Tipo in Hermosa, Bataan, the SCTEX serves as one of the main expressways in Luzon. The expressway is also connected to the Central Luzon Link Expressway, North Luzon Expressway, Tarlac–Pangasinan–La Union Expressway, and the Subic Freeport Expressway. The SCTEX is the country's longest expressway at 93.77 kilometers (58.27 mi). The Subic–Clark–Tarlac Expressway was constructed to provide a more efficient transport corridor between Subic Bay Freeport, Clark, and the Central Techno Park in Tarlac, foster development on the municipalities served, and connect major infrastructures such as the Subic Seaport and Clark International Airport.

The expressway also serves as a major utility corridor, carrying various high voltage overhead power lines through densely populated areas where acquisition and designation of right of way or power line alignment and lands for their associated structures is impractical. A notable power line using the expressway's right of way for most or part of the route is the Concepcion–Clark transmission line from Clark North Exit in Mabalacat, Pampanga to Concepcion, Tarlac.

Built by the Bases Conversion and Development Authority (BCDA), a government owned and controlled corporation, construction of the expressway started on April 5, 2005. Commercial operations then started on April 28, 2008, with the opening of the Subic–Clark Segment and Zone A of the portion of Clark-Tarlac Segment. The opening of Zones B and C of the remaining Clark–Tarlac Segment on July 25, 2008, signaled the full operations of the SCTEX.