The MacArthur Highway, officially the Manila North Road, is a 684.855-kilometer (425.549 mi), two-to-six lane, national primary highway and tertiary highway in Luzon, Philippines, connecting Caloocan in Metro Manila to Aparri in Cagayan at the north. It is the second longest road in the Philippines, after Pan-Philippine Highway. It is primarily known as MacArthur Highway in segments from Caloocan to Urdaneta, Pangasinan, although it is also applied up to Ilocos Sur, and likewise called as Manila North Road for the entire length.