The Tarlac–Pangasinan–La Union Expressway (TPLEX), signed as E1 of the Philippine expressway network and R-8 of the Metro Manila arterial road network, is a controlled-access toll expressway that connects the Central Luzon region with the Ilocos Region. From its northern terminus at Rosario in La Union to its southern terminus at Tarlac City, the expressway has a length of 89.21-kilometer (55.43 mi), cutting through the various provinces in northern Central Luzon.