Numbered highways in the United States

Highways in the United States are split into at least four different types of systems, Interstate Highways, U.S. Highways, state highways, and county highways. Highways are generally organized by a route number or letter. These designations are generally displayed along the route by means of a highway shield. Each system has its own unique shield design that will allow quick identification to which system the route belongs. Below is a list of the different highway shields used throughout the U.S.

Interstate Highways

Interstate Highway shields
Standard Interstate Standard Interstate, wide California and Iowa style Interstate Business Loop Business Spur

The Interstate Highway System is a federally funded and administered (but state-maintained) system of freeways that forms the transportation backbone of the U.S., with millions of Americans relying on it for commutes and freight transport daily. Interstate highways are all constructed to precise standards, designed to maximize high-speed travel safety and efficiency. Interstate Highways also contain auxiliary routes, which are normally assigned a three-digit route number. All Interstate Highways are part of the National Highway System, a network of highways deemed essential to the defense, economy, and mobility of the country.

U.S. Highways

U.S. Highway shields
Standard U.S. Highway Standard U.S. Highway, wide California style U.S. Highway 1948-era U.S. Highway Original U.S. Highway

The U.S. Highway System (officially "United States Numbered Highways") is an older system consisting mostly of surface-level trunk roads, coordinated by the American Association of State Highway and Transportation Officials and maintained by state and local governments. U.S. highways have been relegated to regional and intrastate traffic, as they have been largely supplanted by the Interstate system for long-distance travel except in areas (especially in the west) where the Interstate system is absent or underdeveloped. This has led to the decommissioning and truncation of U.S. Highways that were formerly vital long-haul routes, such as U.S. Route 21 and U.S. Route 66.

State highways

State highway shields
Alabama Alaska Arizona Arkansas California

Colorado Conn. Delaware Florida Georgia

Hawaii Idaho Illinois Indiana Iowa

Kansas Ky. Louisiana Maine Maryland

Mass. Michigan Minnesota Miss. Missouri

Montana Neb. Nevada New Hamp. New Jersey

New Mexico New York North Carolina North Dakota Ohio

Okla. Oregon Penn. Rhode Island South Carolina

South Dakota Tennessee Texas Utah Vermont

Virginia Wash. West Virginia Wisc. Wyoming

Each state also has a state highway system. State highways are of varying standards and quality. Some state highways become so heavily traveled they are built to Interstate Highway standards. Others are so lightly traveled that they are roads of low quality.

Many state highway markers are designed to suggest the geographic shape of the state or some other state symbol such as its flag. Most of the others are generically rectangular or some other neutral shape. The default design for state highway markers is the circular highway shield, which is how state highways are designated on most maps. Several states still use the circular shield for road signage on their state highways.^[1]

Secondary highways

Secondary state highway shields
Arizona Loop Missouri Supp. Montana Sec. Neb. Link Neb. Rec. Road

Neb. Spur Penn. Quadrant Route Tenn. Sec. Texas Beltway Texas FM Road

Texas Loop Texas Park Road Texas RM Road Texas Rec. Road Texas Spur

Vermont Town Highway Virginia Sec.

Territorial highways

Territorial highway shields
American Samoa DC Guam Northern Marianas Puerto Rico Virgin Islands

County highways

County highway shields
Standard County Square variant Clark County, Nev., variant West Virginia variant Wisc. variant

The final administrative level in some states is the county highway. As the name suggests, this type of road is maintained by a county. In Louisiana, "parish roads" exist in place of county highways, as counties in that state are called parishes. County roads vary widely from well-traveled multilane highways to dirt roads into remote parts of the county.

Other systems

Other systems
Forest Highway Indian Route Bicycle Route Charlotte, NC, City Route

History

In 1918, Wisconsin became the first state to number its highways.^[2] In 1926 the American Association of State Highway Officials (AASHO) established and numbered interstate routes (U.S. route numbers), selecting the best roads in each state that could be connected to provide a rational network of "federal" highways.^[3]

See also

• List of roads and highways
• List of toll roads
• National Highway System
• New England road marking system
• Numbered highways in Canada
• Road signs in the United States
• United States Bicycle Route System
• Bicycle route

References

External links

Wikimedia Commons has media related to State highways in the United States.

• Full list of state route markers
• Road Signs (drawings and photos of old and new signs)
• Old Trails - US and Canadian Roads in the 20th Century (includes drawings and photos of old signs)

Numbered highways in the United States National systems Interstate Highways U.S. Numbered Highways State highways Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming Other areas American Samoa District of Columbia Guam Northern Mariana Islands Puerto Rico Virgin Islands

Route designations in the United States Multistate systems Interstate Auxiliary Business U.S. Highway Intrastate systems Toll road State highway County highway Farm-to-market road State- and district- specific types District of Columbia route Missouri supplemental route Montana secondary route Nebraska Connecting Link, Spur, and Recreation routes New York State Parkway Pennsylvania quadrant route Tennessee secondary route Texas Loop, Spur, Park, Recreation, and Beltway routes Special route types Alternate route Business/city route Bypass route Connector route Divided route Emergency detour route Loop route Scenic route Spur route Street types Numbered street Other U.S. Bicycle Route Forest highway Indian route Territorial highway