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The shields for Interstate highways (left) and U.S. routes (right) can be seen on this set of reassurance markers in Southwest Virginia indicating two sets of wrong-way concurrencies. 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 ...
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 ...
Over time, the design of the Interstate shield has changed. In 1957 the Interstate shield designed by Texas Highway Department employee Richard Oliver was introduced, the winner of a contest that included 100 entries; [87] [88] at the time, the shield color was a dark navy blue and only 17 inches (43 cm) wide. [89]
Highways are split into at least four different types of systems in the United States: 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 ...
Route shield pavement markings for Interstate Highways 30 and 35E at the Dallas Horseshoe. A route shield pavement marking (also called an advance pavement marking [1] or pavement marking shield [2]) is a road surface marking that depicts a route shield and functions as either a road traffic safety measure or a mitigation against street sign theft.
However, despite sharing the "Interstate" designation and similar shield design, business Interstates are not actually considered part of the mainline Interstate Highway System. They are treated more as auxiliary or supplemental routes that complement the overall Interstate network, rather than being fully integrated components.
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The Interstate Highways on the island of Oʻahu, Hawaii are signed with the standard Interstate Highway shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate Highways.