The North Luzon Expressway (NLEX),[a] signed as E1 of the Philippine expressway network, partially as N160[b] of the Philippine highway network, and partially as R-8[b] of the Metro Manila arterial road network,[c] is a controlled-access highway that connects Metro Manila to the provinces of the Central Luzon region in the Philippines. The expressway, which includes the main segment and its various spurs, has a total length of 101.8 kilometers (63.3 mi) and travels from its northern terminus at Santa Ines Interchange in Mabalacat, Pampanga, to its southern terminus at Balintawak Interchange in Quezon City, which is adjacent to its connection to Skyway, an elevated toll road that connects the expressway to its counterpart in the south, the South Luzon Expressway. The segment of the expressway between Santa Rita Exit in Guiguinto and the Balintawak Interchange is part of Asian Highway 26 of the Asian highway network. Although its name implies a connection to northern Luzon, the expressway's northern end is actually in Central Luzon.
The North Luzon Expressway was built in the 1960s as part of the government's program to develop areas adjacent to Metro Manila, with NLEX serving the north. The expressway was originally controlled by the Philippine National Construction Corporation (PNCC), until the expressway's operations and maintenance was transferred on February 10, 2005, to the NLEX Corporation, a subsidiary of Metro Pacific Investments Corporation (a former subsidiary of Lopez Holdings Corporation until August 2008). The expressway was expanded and rehabilitated from 2003 to February 2005, modernizing the road and its facilities.
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