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The United States Numbered Highway System 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 ...
Major north–south routes generally have numbers ending in "1", while major east–west routes usually have numbers ending in "0". [1] [c] Three-digit numbered highways are generally spur routes of parent highways; for example, U.S. Route 264 (US 264) is a spur off US 64.
Segments connected by road through Yellowstone National Park: US 90: 1,633: 2,628 I-10 in Van Horn, TX: SR A1A in Jacksonville Beach, FL: 1926: current Follows the Gulf Coast of the US US 91: 163: 262 I-15, I-84 in Brigham City, UT: US 26 southwest of Idaho Falls, ID: 1926: current US 92: 177: 285 I-175, I-375, SR 687 in St. Petersburg, FL
A route (or road) number, designation or abbreviation is an identifying numeric (or alphanumeric) designation assigned by a highway authority to a particular stretch of roadway to distinguish it from other routes and, in many cases, also to indicate its classification (e.g. motorway, primary route, regional road, etc.), general geographical location (in zonal numbering systems) and/or ...
In 1926, the United States Numbered Highway System was established, creating the first national road numbering system for cross-country travel. The roads were funded and maintained by U.S. states, and there were few national standards for road design. United States Numbered Highways ranged from two-lane country roads to multi-lane freeways.
Road numbers (the term "highway" is not in general use in the UK) are prefixed by a letter indicating the type of road, for example M1, A1, B123 in the UK; A1, N1, D1 in France. These are sometimes highlighted with a different background color, depending on the class of highway and the context of the sign.
For example, road "200 E" would be a north–south road located 2 miles (3.2 km) east of the meridian line, and road "350 N" would be an east–west road located 3.5 miles (5.6 km) north of the division line. Roads along a county line may be given a grid designation or may be referred to as County Line Road.
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 ...