List of Interstate Highways
There are 70 primary Interstate Highways in the Interstate Highway System, a network of controlled-access freeways in the United States. They are assigned one- or two-digit route numbers, whereas their associated "auxiliary" Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south-north, with lower numbers in the west and higher numbers in the east; even-numbered Interstates run west-east, with lower numbers in the south and higher numbers in the north. Highways whose route numbers are divisible by "5" usually represent major coast-to-coast or border-to-border routes (ex. I-10 travels from Santa Monica, California, to Jacksonville, Florida, traveling from the Pacific to Atlantic oceans). Additionally, auxiliary highways have their numbering system where a different number prefixes the number of its parent highway.
Transportation in New York City
A less favored alternative to commuting by rail and boat is the New York region's expressway network, designed by Robert Moses. The city's extensive network of expressways includes four primary Interstate Highways: Interstate 78, Interstate 80, Interstate 87 and Interstate 95. Interstate 78 and Interstate 87, which have, respectively, their eastern and southern termini in the city, as well as Interstate 95 enter the city limits, while Interstate 80's eastern terminus is in Teaneck, New Jersey. I-278 and I-287 each serve as a partial beltway around the city; Interstate 278 in Staten Island, Brooklyn, Queens, and the Bronx, and Interstate 287 in Westchester County, Rockland County, and Northern New Jersey. I-495 begins at the Queens Midtown Tunnel as the Queens-Midtown Expressway, becomes the Horace Harding Expressway between Queens Blvd and the Nassau County limits and finally becomes the Long Island Expressway into the Long Island suburbs. The 'LIE' moniker is commonly used by denizens of the city to describe the entire length of highway.