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Number Length (mi) [5] [b] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes US 1: 2,369: 3,813 Fleming and Whitehead streets in Key West, FL: Route 161 at Canadian border in Fort Kent, ME: 1926: current Follows the East Coast of the United States, longest north-south US Highway US 2: 2,112: 3,399
In 1918, Wisconsin became the first state to number its highways in the field followed by Michigan the following year. [1] In 1926 the American Association of State Highway Officials (AASHO) established and numbered interstate routes (United States Numbered Highways), selecting the best roads in each state that could be connected to provide a national network of federal highways.
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.
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 ...
The route numbering system is composed of National Highways, National Routes, State Routes, and Tourist Drives. Each route has a unique number, except for National Highway 1 and National Route 1, which mark Highway 1 in Western Australia. Routes are denoted on directional signs and roadside poles by appropriately numbered markers, the design of ...
These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower numbers in the south and higher numbers in the north; odd-numbered Interstates run north–south, with lower numbers in ...
Primary Interstates are assigned one- or two-digit numbers, while shorter routes (such as spurs, loops, and short connecting roads) are assigned three-digit numbers where the last two digits match the parent route (thus, I-294 is a loop that connects at both ends to I-94, while I-787 is a short spur route attached to I-87). In the numbering ...
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 ...