runs toward the center of the city, and both Interstate 64 and Interstate 44 enter the city on the west, running parallel to the east. Two of the four interstates (Interstates 55 and 64) merge south of Gateway Arch National Park and leave the city on the Poplar Street Bridge into Illinois, while Interstate 44 terminates at Interstate 70 at its new interchange near N Broadway and Cass Ave. A small portion of the Interstate 270 outer belt freeway runs through the northern end of the city. The 563-mile Avenue of the Saints links St. Louis with St. Paul, Minnesota. Major roadways include the north–south Memorial Drive, located on the western edge of Gateway Arch National Park and parallel to Interstate 70, the north–south streets of Grand Boulevard and Jefferson Avenue, both of which run the length of the city, and Gravois Road, which runs from the southeastern portion of the city to downtown and used to be signed as U.S. Route 66. An east-west roadway that connects the city with surrounding communities is Martin Luther King, Jr. Drive, which carries traffic from the western edge of the city to downtown. Metro Light Rail and Subway The St. Louis metro area is served by MetroLink (known as Metro) and is the 11th-largest light rail system in the country with of double track light rail. The Red Line and The Blue Line both serve all the stations in the inner city, and branch to different destinations beyond in the suburban areas. Both lines enter the city north of Forest Park on the western edge of the city or on the Eads Bridge in downtown St. Louis to Illinois. All of the system track is in independent right of way, with both surface level and underground subway track in the city. All stations are independent entry, while all platforms are flush-level with trains. Rail service is provided by the Bi-State Development Agency (also known as Metro), which is funded by a sales taxes levied in the city and other counties in the region. The Gateway Multimodal Transportation Center acts as the hub station in the city of St. Louis, linking the city's light rail system, local bus system, passenger rail service, and national bus service. It is located just east of the historic grand St. Louis Union Station. Airports St. Louis is served by two passenger airports. St. Louis Lambert International Airport,