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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.
In the U.S. state of New Jersey, the New Jersey Department of Transportation (NJDOT) maintains a system of state highways. Every significant section of roadway maintained by the state is assigned a number, officially State Highway Route X but commonly called Route X by the NJDOT and the general public. Interstate Highways and U.S. Highways are included in the system, and are typically also called Route X, as there is no duplication of numbers between the systems. State Routes are signed with the standard circular highway shield. The majority of Routes are maintained by the state, but occasionally, for the sake of continuity, a local road is designated and signed as part of a Route. Additionally, all toll roads in New Jersey are assigned internal numbers by the NJDOT — the New Jersey Turnpike is 700, the Garden State Parkway is 444, the Palisades Interstate Parkway is 445, and the Atlantic City Expressway is 446.
The State Highway System of the U.S. state of Florida comprises the roads maintained by the Florida Department of Transportation (FDOT) or a toll authority. The components are referred to officially as state roads, abbreviated SR.
In the U.S. state of New Jersey, county routes exist in all 21 counties. They are typically the fourth type of roadway classified below the Interstate Highway, the U.S. Route numbered highway and the state highway. The County Route system is defined by two types in New Jersey. First, 500 Series County Routes, also called state secondary routes, are county highways numbered in a statewide system with three-digit numbers that begin with 5. These roads form a second network of routes that supplement the facilitation of the State Routes. Each 500 Series route is unique and is not permitted to be duplicated in another county for a separate route. The second category is defined as Non-500 Series County Routes. Non-500 Series County Routes include 1-digit, 2-digit, 600 Series, 700 Series and 800 Series. These, by definition, are discontinuous across county borders and must be contained entirely within that county. Unlike 500 Series County routes, these route numbers are unique to each county, and are typically assigned to more local routes than the statewide 500-series county route system. They are typically of a lesser classification of streets like minor arterials or collector roadways rather than major arterials or thoroughfares. In the counties that use 600-series numbers, the selection of this range was coordinated within the state, gradually replacing older systems of mainly one- and two-digit routes.
The Massachusetts State Highway System in the U.S. state of Massachusetts is a system of state-numbered routes assigned and marked by the highway division of the Massachusetts Department of Transportation (MassDOT). U.S. Highways and Interstate Highways are included in the system; the only overlaps are with the end-to-end U.S. Route 3 and Route 3 and the far-apart Interstate 295, shared with Rhode Island, and Route 295, shared with New York State. A state highway in Massachusetts is a road maintained by the state, which may or may not have a number. Not all numbered routes are maintained or owned by the state.
The 1964 state highway renumbering was a reorganization of state highways in the U.S. state of Washington. The new system, based on sign routes, replaced the primary and secondary highway system implemented in 1937. It was first signed in January 1964 and codified into the Revised Code of Washington in 1970.
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.
The History of State Highways in Virginia begins with Virginia's State Highway Commission, which was formed by the General Assembly in 1906. In 1918 the General Assembly designated a 4002-mile state highway system to be maintained by the Commission. Beginning in 1922, the Commission was authorized to add annually mileage equal to 2.5% of the original system. These highways were numbered from 1 into the 20s; by 1922 suffixed spurs had been added. In 1923, the first renumbering was implemented, in which State Routes 1 to 9 became 31 to 39. The spurs were renamed to use numbers rather than letters, and four-digit numbers were used for spurs of spurs or for "rollovers".
In 1933, the U.S. state of Virginia renumbered almost all of its state highways. This renumbering was caused by the assignment of numbers from 600 up to the new secondary system, but all three-digit numbers were affected. At the same time, all numbers that conflicted with U.S. Routes - except State Route 13 - were renumbered, and all long overlaps with U.S. Routes were eliminated. Several new routes had the same numbers as U.S. Routes and served as their extensions.
In 1955, Louisiana passed a law that undertook a comprehensive revision to the state highway classification and numbering system. The new system designated roads by importance to travel patterns and rectified the previous numbering system under new unified designations.
In the U.S. state of Pennsylvania, state highways are generally maintained by the Pennsylvania Department of Transportation (PennDOT). Each is assigned a four-digit State Route (SR) number in the present Location Referencing System. Traffic Routes are signed as Interstate Highways, U.S. Routes and Pennsylvania Routes, and are prefixed with one to three zeroes to give a four-digit number. PA Routes are also called Pennsylvania Traffic Routes, and formerly State Highway Routes.