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Example of an original U.S. Route shield, with the state name of "Michigan" and route number of "27" displayed in the original block font. The original design of the shield was presented in the January 1927 edition of the Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs, the precursor to the Manual on Uniform Traffic Control Devices ...
A highway shield or route marker is a sign denoting the route number of a highway, usually in the form of a symbolic shape with the route number enclosed. As the focus of the sign, the route number is usually the sign's largest element, with other items on the sign rendered in smaller sizes or contrasting colors.
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 indicated on most maps and atlases.
1961 version of the U.S. Route shield. The Federal Aid Highway Act of 1956 appropriated funding for the Interstate Highway System, to construct a vast network of freeways across the country. By 1957, AASHO had decided to assign a new grid to the new routes, to be numbered in the opposite directions as the U.S. Highway grid.
Route shield pavement markings along Historic U.S. Route 66 in Amboy, California.. Route shield pavement markings are closely associated with U.S. Route 66.Owing to the original route's fame, reassurance markers for "Historic U.S. Route 66" have often been stolen by souvenir hunters, so many localities have painted or stenciled the U.S. Route shield or outline directly onto the pavement.
11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).
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The green shield is employed to mark the main route through a city's central business district, which intersects the associated Interstate at one (spur) or both (loop) ends of the business route. The route usually traverses the main thoroughfare(s) of the city's downtown area or other major business district. [85]