Interstate Highways use a numbering scheme in which primary Interstates are assigned one- or two-digit numbers, and shorter routes which branch off from longer ones are assigned three-digit numbers …

Sep 12, 2019 · The number of digits tells you whether an interstate connects multiple metro areas, or exists solely within a single metro area. One and two-digit interstates span multiple regions, while …

Complete 2025 guide to understanding US highway numbering systems, Interstate highways, US routes, state highways, and county roads. Learn the logic behind the numbers.

This map shows the Interstate highways in the contiguous US, color-coded by route number and type. (Alaska, Hawaii, and Puerto Rico also have Interstate highways, but use separate numbering systems.)

On numbering, the Joint Board directed Acting Chairman James to establish a committee of five, with himself as chairman, to present a system to the members on August 4 for numbering this system of …

Dec 12, 2025 · Learn the logical rules that instantly tell you a highway's direction, location, and function, plus rare exceptions.

Nov 28, 2025 · The numbering system helps you read direction, rough location, and route type from a sign in seconds. Below is a clear guide to how interstate numbers work, plus the exceptions that …

Oct 29, 2024 · Learn the differences between highways, interstates, and auxiliary routes. Understanding the U.S. highway numbering system can help you optimize your trip planning, avoid congestion, and …

Feb 25, 2025 · Unlock the secrets of highway numbers with our comprehensive guide. Learn how highway numbers can help you navigate U.S. roads effortlessly.

Nov 26, 2025 · In the US highway numbering system, every number tells a story of geography, direction, and purpose. From freeway numbers to the interstate grid, the entire system is a carefully designed …