The United States Numbered Highway System is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these highways were coordinated among the states, they are sometimes called Federal Highways, but the roadways were built and have always been maintained by state or local governments since their initial designation in 1926.
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,021 miles (4,862 km). It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain West, Great Plains, Midwest, and the Northeast, ending in Boston, Massachusetts. The highway serves 13 states and has sixteen auxiliary routes, primarily in major cities such as Chicago, Cleveland, Buffalo, and Rochester.
U.S. Route 2 or U.S. Highway 2 (US 2) is an east–west U.S. Highway spanning 2,571 miles (4,138 km) across the northern continental United States. US 2 consists of two segments connected by various roadways in southern Canada. Unlike some routes, which are disconnected into segments because of encroaching Interstate Highways, the two portions of US 2 were designed to be separate in the original 1926 highway plan.
U.S. Route 212 (US 212) is a spur of U.S. Route 12. It runs for 949 miles (1,527 km) from Minnesota Highway 62 at Edina, Minnesota to Yellowstone National Park. It does not intersect U.S. 12 now, but it once had an eastern terminus at U.S. 12 in St. Paul, Minnesota.
Interstate 86 (I-86) is an east–west intrastate Interstate Highway located entirely within the state of Idaho. It runs approximately 63 miles (101 km) from an intersection with I-84 east of Declo in rural Cassia County, to an intersection with I-15 in Chubbuck, just north of Pocatello. The highway is part of the main route from Boise and Twin Falls to Idaho Falls and the upper Snake River region.
Forgottonia, also spelled Forgotonia, is the name given to a 16-county region in Western Illinois in the late 1960s and early 1970s. This geographic region forms the distinctive western bulge of Illinois that is roughly equivalent to "The Tract", the Illinois portion of the Military Tract of 1812, along and west of the Fourth Principal Meridian. Since this wedge-shaped region lies between the Illinois and Mississippi rivers, it has historically been isolated from the eastern portion of Central Illinois.
Interstate 80 (I-80) traverses the northern portion of the U.S. state of Nevada. The freeway serves the Reno–Sparks metropolitan area and passes through the towns of Fernley, Lovelock, Winnemucca, Battle Mountain, Carlin, Elko, Wells and West Wendover on its way through the state.
Lookout Pass is a mountain pass in the Rocky Mountains of the northwestern United States. In the Coeur d'Alene Mountains of the Bitterroot Range, the pass is on the border between Idaho and Montana, traversed by Interstate 90 at an elevation of 4,710 feet (1,436 m) above sea level.
Interstate 80 (I-80) in the U.S. state of Nebraska runs east from the Wyoming state border across the state to Omaha. Construction of the stretch of I-80 spanning the state was completed on October 19, 1974. Nebraska was the first state in the nation to complete its mainline Interstate Highway System.
Interstate 40 (I-40) is an east–west Interstate Highway that has a 359.11-mile (577.93 km) section in the US state of Arizona, connecting sections in California and New Mexico. The Interstate is also referred to as the Purple Heart Trail to honor those wounded in combat who have received the Purple Heart. It enters Arizona from the west at a crossing of the Colorado River southwest of Kingman. It travels eastward across the northern portion of the state, connecting the cities of Kingman, Ash Fork, Williams, Flagstaff, Winslow, and Holbrook. I-40 continues into New Mexico, heading to Albuquerque. The highway has major junctions with U.S. Route 93 (US 93)—the main highway connecting Phoenix and Las Vegas, Nevada—in Kingman and again approximately 22 miles (35 km) to the east and I-17—the freeway linking Phoenix to northern Arizona) in Flagstaff.
Interstate 80 (I-80) is a part of the Interstate Highway System that runs from San Francisco, California, to Teaneck, New Jersey. The portion of the highway in the U.S. state of Utah is 196.35-mile-long (315.99 km), through the northern part of the state. From west to east, I-80 crosses the state line from Nevada in Tooele County and traverses the Bonneville Salt Flats—which are a part of the larger Great Salt Lake Desert. It continues alongside the Wendover Cut-off—the corridor of the former Victory Highway—U.S. Route 40 (US-40) and the Western Pacific Railroad Feather River Route. After passing the Oquirrh Mountains, I-80 enters the Salt Lake Valley and Salt Lake County. A short portion of the freeway is concurrent with I-15 through Downtown Salt Lake City. At the Spaghetti Bowl, I-80 turns east again into the mouth of Parley's Canyon and Summit County, travels through the mountain range and intersects the eastern end of I-84 near Echo Reservoir before turning northeast towards the Wyoming border near Evanston. I-80 was built along the corridor of the Lincoln Highway and the Mormon Trail through the Wasatch Range. The easternmost section also follows the historical routes of the First Transcontinental Railroad and US-30S.
Interstate 90 (I-90) is a transcontinental Interstate Highway that runs east–west across the northern United States. Within the state of Idaho, the freeway travels for 74 miles (119 km) from the Washington border near Spokane to Coeur d'Alene and the panhandle region at the north end of the state. After traveling through the Silver Valley along the Coeur d'Alene River in the Bitterroot Range, I-90 crosses into Montana at Lookout Pass.
Interstate 90 (I-90) is an east–west transcontinental Interstate highway across the northern United States, linking Seattle to Boston. The portion in the state of Montana is 554.10 miles (891.74 km) in length, passing through fourteen counties in central and southern Montana. Due to the large size of Montana, it is the longest segment of Interstate 90 within a single state.
In the U.S. state of South Dakota, Interstate 90 (I-90) traverses east–west through the southern half of the state.
Interstate 64 (I-64) in the U.S. state of Kentucky travels for 191 miles (307 km), passing by the major towns and cities of Louisville, Frankfort, Lexington and Ashland. It has several major junctions with other Interstates, including I-65, I-71, I-264 and I-265 in Louisville, and I-75 in Lexington.
Below is a list and summary of the former state highways.
Transportation in Montana comprises many different forms of travel. Montana shares a long border with Canada, hence international crossings are prevalent in the northern section of the state; there are 13 road crossings and one rail crossing.
U.S. Route 10, also U.S. Highway 10 (US 10) was a United States Numbered Highway in the state of Montana from 1926 to 1986. It was replaced with Interstate 90 (I-90) and I-94 as well as their respective business routes. It was the longest segment of US 10 in one state.
