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.
U.S. Route 13 in North Carolina
The section of U.S. Route 13 (US 13) in North Carolina is the longest, home to of its length. It runs southwest to northeast through eastern North Carolina, beginning at Interstate 95. Most of the routing is rural, serving only three cities of considerable size along the entire route; the rest passes through forests and farmland. US 13 is usually only two lanes wide unless it is co-signed with other highways, usually near cities as bypasses.