The Skyway serves as the region's main expressway, directly connecting the North Luzon Expressway and the South Luzon Expressway. It also enables access to the Ninoy Aquino International Airport via the NAIA Expressway (NAIAX). The Skyway is the first fully grade-separated highway in the Philippines and one of the longest elevated highways in the world with a total length of approximately . Other expressways such as the Manila–Cavite Expressway and Muntinlupa–Cavite Expressway also connect Metro Manila to its surrounding areas.