The Candaba Viaduct (also known as Pulilan–Apalit Bridge) is a 5 km (3 mi). bridge passing over the Candaba Swamp and adjacent Pampanga River in the North Luzon Expressway. It is one of the longest bridges in the Philippines consists of 4 lanes (2 northbound and 2 southbound). Overlooking Mount Arayat, viaduct is raised over Candaba Swamp which keeps the highway open to traffic, even when the swamp gets flooded during the rainy season.