Numbered highways in the United States

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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[edit]

Interstate Highway shields
Interstate 90 route marker
Standard Interstate
Interstate 476 route marker
Standard Interstate, wide
Interstate 80 (Iowa) route marker
California and Iowa style Interstate
Business Loop 19 route marker
Business Loop
Business Spur 44 route marker
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[edit]

U.S. Highway shields
U.S. Highway 20 route marker
Standard U.S. Highway
U.S. Highway 287 route marker
Standard U.S. Highway, wide
U.S. Highway 95 route marker
California style U.S. Highway
U.S. Highway 27 historic route marker
1948-era U.S. Highway
U.S. Highway 66 historic route marker
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[edit]

Main article: State highway
State highway shields
Alabama route marker
Alaska route marker
Arizona route marker
Arkansas route marker
California route marker
Colorado route marker
Connecticut route marker
Delaware route marker
Florida route marker
Georgia route marker
Hawaii route marker
Idaho route marker
Illinois route marker
Indiana route marker
Iowa route marker
Kansas route marker
Kentucky route marker
Louisiana route marker
Maine route marker
Maryland route marker
Massachusetts route marker
Michigan route marker
Minnesota route marker
Mississippi route marker
Missouri route marker
Montana route marker
Nebraska route marker
Nevada route marker
New Hampshire route marker
New Hamp.
New Jersey route marker
New Jersey
New Mexico route marker
New Mexico
New York route marker
New York
North Carolina route marker
North Carolina
North Dakota route marker
North Dakota
Ohio route marker
Oklahoma route marker
Oregon route marker
Pennsylvania route marker
Rhode Island route marker
Rhode Island
South Carolina route marker
South Carolina
South Dakota route marker
South Dakota
Tennessee route marker
Texas route marker
Utah route marker
Vermont route marker
Virginia route marker
Washington route marker
West Virginia route marker
West Virginia
Wisconsin route marker
Wyoming route marker

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[edit]

Main article: Secondary highway
Secondary state highway shields
Arizona loop route marker
Arizona Loop
Missouri secondary route marker
Missouri Supp.
Montana secondary route marker
Montana Sec.
Nebraska connecting link route marker
Neb. Link
Nebraska recreation route marker
Neb. Rec. Road

Neb. Spur
Pennsylvania quadrant route marker
Penn. Quadrant Route
Tennessee secondary route marker
Tenn. Sec.
Texas beltway route marker
Texas Beltway
Texas farm to market road route marker
Texas FM Road
Texas loop route marker
Texas Loop
Texas park road marker
Texas Park Road
Texas ranch to market road route marker
Texas RM Road
Texas recreational road marker
Texas Rec. Road
Texas spur route marker
Texas Spur
Vermont town route marker
Vermont Town Highway
Virginia secondary route marker
Virginia Sec.

Territorial highways[edit]

Territorial highway shields
American Samoa route marker
American Samoa
District of Columbia route marker
Guam route marker
Northern Mariana Islands route marker
Northern Marianas
Puerto Rico route marker
Puerto Rico
U.S. Virgin Islands route marker
Virgin Islands

County highways[edit]

Main article: County highway
County highway shields
Mills County Road H10 route marker
Standard County
St. Louis County Road 7 route marker
Square variant
Clark County (NV) Route 215 route marker
Clark County, Nev., variant
West Virginia County Road 9/1 route marker
West Virginia variant
Wisconsin County Truck Highway Z route marker
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[edit]

Other systems
Forest Highway route marker
Forest Highway
Indian route marker
Indian Route
Bicycle route marker
Bicycle Route
Charlotte (North Carolina) route marker
Charlotte, NC, City Route


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[edit]


External links[edit]