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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

ROUTE NUMBERING NOT A CASUAL EFFORT

Route numbering principles remain virtually unchanged since their inception in 1926, providing a simple scheme to ensure consistency and easy travel for the public. Interstate highways are designated with a single or double-digit number. Even numbers generally run east-west, with the numbers increasing from south to north; while odd numbers generally run north-south, with the numbers increasing from west to east. Triple-digit highways are spurs or beltways stemming from single or double-digit highways passing through urban areas. With U.S. routes, the above rules still hold, except that the even numbers increase north to south and the odd numbers increase from east to west. The American Association of State Highway and Transportation Officials (AASHTO) Special Committee on U.S. Route Numbering, comprised of one representative from each AASHTO region, has responsibility for overseeing the route numbering system, including the consideration of route number changes. The committee also makes recommendations to the Standing Committee on Highways on the development and adoption of Uniform Map Symbols and on the development and use of Official Route Markers.

Language

  • English

Media Info

  • Pagination: p. 4-5
  • Serial:
    • AASHTO Quarterly Magazine
    • Volume: 76
    • Issue Number: 2
    • Publisher: American Association of State Highway and Transportation Officials (AASHTO)
    • ISSN: 0147-4820

Subject/Index Terms

Filing Info

  • Accession Number: 00745583
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 24 1998 12:00AM