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Mastering the US Highway System

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Thanks to modern technology, we often take road signs throughout the country for granted. But there’s a lot that goes into the naming and labeling of each highway. With these explanations and fun facts, you’ll become a road warrior in no time.

interstate texas sign

Interstate Highways  

  • Established under the Eisenhower administration, signs are marked with red-and-blue shields.
  • Major highways are identified by one- and two-digit numbers.
  • Routes that go north­ to south are assigned odd numbers, with the numbers growing larger from the west to the east.

Example: Interstate 5 runs through California, Oregon, and Washington, from the Mexican border to the Canadian border.

  • Routes that go from the east to the west are assigned even numbers, with the numbers growing larger from the south to the north.

Example: Interstate 90 crosses the United States from Seattle, Washington, all    the way to Boston, Massachusetts.

 

US Highway signage

US Highways

  • US highways are labeled with black-and-white badge signs, and range from one to three digits.
  • These highways follow the same odd-and-even method of interstates, but the numbers grow in opposite directions.

North-South: US Highway 1 runs from Maine to Florida.
East­-West: US Highway 82 runs from New Mexico to Georgia.

 

state route signs

State and County Routes

  • Signage for these routes differs based on each state and county.
  • For the most part, states follow both the Interstate and US Highway patterns, assigning odd numbers to north-to-south routes and even numbers to east-to-west routes.

 

fast facts sign

Fast Facts!

  • It took 17 years to create, and fund the idea of the interstate.
  • The states set the speed limits.
  • The red-and-blue shields used to designate interstate signs are trademarked by the American Association of State Highway officials.
  • There are no design rules dictating the shape of roads.
  • No state has fewer than 3 interstates.

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