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 19
New York State Route 19 (NY 19) is a north–south state highway in Western New York in the United States. It is the longest state highway in that region, and the only other one besides NY 14 to completely transect the state from the Pennsylvania state line to the shore of Lake Ontario. It continues south into Pennsylvania as Pennsylvania Route 449 (PA 449) and ends at an intersection with the Lake Ontario State Parkway just south of the lakeshore in Hamlin. NY 19 does not serve any major cities or metropolitan areas and remains a two-lane rural road for almost its entire length. However, it follows the Genesee River for much of its lower length, and offers easy access to the gorges of Letchworth State Park midway along its route.