The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.
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.
U.S. Route 53, or U.S. Highway 53 (U.S. 53), is a north–south U.S. highway that runs for 404 miles (650 km) from La Crosse, Wisconsin to International Falls, Minnesota. It is the primary north–south route in northwestern Wisconsin, serving as a vital link between I-94 at Eau Claire, Wisconsin and the Twin Ports of Superior, Wisconsin, and Duluth, Minnesota. The entire route from Eau Claire to the city limits of Superior is a four lane divided highway. The highway's northern terminus is at the Fort Frances–International Falls International Bridge in International Falls, Minnesota, at the Canada–US border. Its southern terminus is in La Crosse, Wisconsin, at U.S. Highway 14.
A concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers. When two roadways share the same right-of-way, it is sometimes called a common section or commons. Other terminology for a concurrency includes overlap, coincidence, duplex, triplex, multiplex, dual routing or triple routing.
U.S. Route 730 (US 730) is an east–west United States Numbered Highway, of which all but 6.08 miles of its 41.78 miles are within the state of Oregon. The highway starts in rural Morrow County in Eastern Oregon at an interchange with Interstate 84 (I-84) and US 30, located east of the city of Boardman. US 730 travels east along the Columbia River as a continuation of Columbia River Highway No. 2 into Umatilla County, intersecting I-82 and US 395 in the city of Umatilla. US 730 and US 395 form a short concurrency within the city before the highways part, and US 730 continues northeast into Washington. The highway travels through rural Walla Walla County and ends at an intersection with US 12 south of Wallula.
The state highway system of the U.S. state of Virginia is a network of roads maintained by the Virginia Department of Transportation (VDOT). As of 2006, the VDOT maintains 57,867 miles (93,128 km) of state highways, making it the third-largest system in the United States.
The United States Bicycle Route System is the national cycling route network of the United States. It consists of interstate long-distance cycling routes that use multiple types of bicycling infrastructure, including off-road paths, bicycle lanes, and low-traffic roads. As with the complementary United States Numbered Highways system for motorists, each U.S. Bicycle Route is maintained by state and local governments. The USBRS is intended to eventually traverse the entire country, like the Dutch National Cycle Routes and the United Kingdom's National Cycle Network, yet at a scale similar to the EuroVelo network that spans Europe.
The North Carolina Highway System consists of a vast network of Interstate, United States, and state highways, managed by the North Carolina Department of Transportation. North Carolina has the second largest state maintained highway network in the United States because all roads in North Carolina are maintained by either municipalities or the state. Since counties do not maintain roads, there is no such thing as a "county road" within the state.
In road transportation in the United States, a special route is a road in a numbered highway system that diverts a specific segment of related traffic away from another road. They are featured in many highway systems; most are found in the Interstate Highway System, U.S. highway system, and several state highway systems. Each type of special route possesses generally defined characteristics and has a defined relationship with its parent route. Typically, special routes share a route number with a dominant route, often referred as the "parent" or "mainline", and are given either a descriptor which may be used either before or after the route name, such as Alternate or Business, or a letter suffix that is attached to the route number. For example, an alternate route of U.S. Route 1 may be called "Alternate U.S. Route 1", "U.S. Route 1 Alternate", or "U.S. Route 1A". Occasionally, a special route will have both a descriptor and a suffix, such as U.S. Route 1A Business.
The State Route System of Tennessee is maintained and developed by the Tennessee Department of Transportation (TDOT) in the U.S. state of Tennessee. Currently the state has 14,150 miles (22,770 km) of state-maintained roadways, including 1,233 miles (1,984 km) of Interstate Highways and 13,077 miles (21,045 km) of State Highways. All of the U.S. Routes in Tennessee have a state route routed concurrently with them, though the state route is hidden and only signed along the green mile marker signs that display mileage within each county. The state route system in Tennessee was established in 1923. Since the 1983 renumbering, state routes have been divided into primary and secondary routes with separate shields used for each.
The State Highways of Washington in the U.S. state of Washington comprise a network of over 7,000 miles (11,270 km) of state highways, including all Interstate and U.S. Highways that pass through the state, maintained by the Washington State Department of Transportation (WSDOT). The system spans 8.5% of the state's public road mileage, but carries over half of the traffic. All other public roads in the state are either inside incorporated places or are maintained by the county. The state highway symbol is a white silhouette of George Washington's head.
The primary highway system makes up over 9,000 miles (14,000 km), approximately 8 percent of the U.S. state of Iowa's public road system. The Iowa Department of Transportation is responsible for the day-to-day maintenance of the primary highway system, which consists of Interstate Highways, United States Highways, and Iowa state highways. Currently, the longest primary highway is U.S. Highway 30 at 332 miles (534 km). The shortest highway is Interstate 129 at 0.27 miles (430 m).
Interstate 87 (I-87) is a partially completed Interstate Highway in the US state of North Carolina, the shortest designated primary Interstate Highway at 12.90 miles (20.76 km) long. The completed portion is in eastern Wake County, between Raleigh and Wendell; the majority of the completed route is known as the Knightdale Bypass, while the remaining three miles (4.8 km) follows the Raleigh Beltline (I-440). It is planned to continue northeast through Rocky Mount, Williamston, and Elizabeth City, ending in Norfolk, Virginia. It is signed as north–south, in keeping with the sign convention for most odd-numbered interstates, but the route goes primarily east–west, with the eastern direction aligning to the north designation. The entire route is concurrent with U.S Highway 64 (US 64), with portions also concurrent with I-440 and US 264.
