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The default design for state highway markers is the circular highway shield, which is how state highways are indicated on most maps and atlases. Currently, five states—Delaware, Iowa, Kentucky, Mississippi, and New Jersey—use the circular shield for road signage on their state highways. [3]
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 ...
The Interstate shield is the only trademarked highway marker in use in the United States (being registered by the American Association of State Highway and Transportation Officials, the trade association of the states' departments of transportation and also a standards organization for highway engineering), and the U.S. Route shield was ...
[citation needed] The reverse happened with U.S. Route 57, originally a Texas state highway numbered to match Mexican Federal Highway 57. [ 9 ] In the 1950s, the numbering grid for the new Interstate Highway System was established as intentionally opposite from the US grid insofar as the direction the route numbers increase.
Since the policy on numbering and designating US Highways was updated in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials ...
The Tennessee Department of Transportation (TDOT) maintains these routes under the "State Highways" title of state law, [1] but designates them as "state routes". The triangle marker design was the only design until November 1983, when Tennessee divided its routes into primary routes and secondary or "arterial" routes with the adoption of a ...
The postmile markers indicate the distance a route travels through individual counties, as opposed to mile markers that indicate the distance travelled through a state. Multiple other states, including Nevada , Ohio , and Tennessee , use similar county-based mile markers on non-interstates, but use standard mileposts on interstate routes.
Appears on 2017–2018 state map. [6] SR 303 — — US 43 south of Linden: SR 69 at Providence: proposed — Proposed Linden Bypass being built as part of the West Alabama Highway 4-laning program to construct a 4-lane divided highway between Thomasville and Tuscaloosa SR 378: 2.320: 3.734 US 78/SR 5 at Birmingham: US 31 at Birmingham 2016 ...