Route 30.

U.S. Route 30 is a historic east-west highway that spans approximately 3,112 miles from Atlantic City, New Jersey, to Astoria, Oregon, making it one of the longest U.S. highways.

Tour.

U.S. Route 30 or U.S. Highway 30 (US 30) is an east–west main route of the United States Numbered Highway System, with the highway traveling across the Northern U.S. With a length of 3,112 miles (5,008 km), it is the third-longest U.S. Highway, after US 20 and US 6. The western end of the highway is at US 101 in Astoria, Oregon; the eastern end is at Virginia Avenue, Absecon Boulevard, and Adriatic Avenue in Atlantic City, New Jersey. The “0” as the last digit in the number indicates that it is a coast-to-coast route and a major east–west route. Despite long stretches of parallel and concurrent Interstate Highways, it has not been decommissioned unlike other long-haul routes such as US 66. It is also the only U.S. Highway that has always been coast-to-coast since the beginning of U.S. Numbered Highway System.

US 20 and US 30 break the general U.S. Highway numbering rules in Oregon, since US 20 actually starts south of US 30 in Newport, running through the middle of Oregon, while US 30 runs parallel to the north of the state (the Columbia River and Interstate 84, or I-84). The two run concurrently and continue in the correct positioning near Caldwell, Idaho. This situation is because US 20 was not a planned coast-to-coast route while US 30 was.

US 30 was originally proposed to run from Salt Lake City, Utah, to Atlantic City, New Jersey. West of Philadelphia, Pennsylvania, this was designated largely along the Lincoln Highway, as part of a promise to the Lincoln Highway Association to assign a single number to their road as much as possible. West of Salt Lake City, US 40 continued to San Francisco, California, although it ran farther north than the Lincoln Highway east of Wadsworth, Nevada, and west of Sacramento, California.