List of Interstate Highways in Washington
Interstate 90 (I-90) is the longest primary Interstate Highway in Washington, which connects Seattle to Spokane and the Idaho border, measuring , while I-82, connecting the Oregon border city of Umatilla to Elensburg via Yakima, is the shortest at . The longest auxiliary Interstate Highway in Washington is I-405, a bypass of Seattle through the Eastside, at , and the shortest is I-705, a spur into downtown Tacoma, at . One route, I-605, has been proposed over the years to form another Eastside bypass, however there are no plans to construct this fifth auxiliary route.
After passage of the Federal Aid Highway Act of 1956, which formed the Interstate Highway System, the American Association of State Highway Officials had approved I-5 and I-90 across Washington on August 17, 1957. I-82 was approved on October 17, 1957, two months after I-5 and I-90, as part of a addition to the Interstate Highway System.
New York State Route 17
At 397 miles, NY 17 is the longest state route in New York, and its second-longest highway of any kind besides the Thruway. It serves 11 counties (Chautauqua, Cattaraugus, Allegany, Steuben, Chemung, Tioga, Broome, Delaware, Sullivan, Orange, and Rockland), passes through the cities of Salamanca, Olean, Corning, Elmira, and Binghamton, and enters the vicinity of several others, including Jamestown and Middletown. As it proceeds across the state, it intersects many of New York's Interstate and U.S. Highways, including U.S. Route 219 (US 219) in Salamanca, I-99 and U.S. Route 15 (US 15) near Corning, I-81 in Binghamton, and I-84 near Middletown. The portion of NY 17 in the vicinity of Waverly is actually located in Pennsylvania; however, it is maintained by the New York State Department of Transportation.