Interstate route marker sign
Identifies an Interstate highway by number.
MUTCD designation M1-1. See the federal MUTCD, page 82.
How to read signs like this
Shield-shaped and other route markers identify Interstate, U.S. and state highways by number.
Practice question
What kind of route does this shield mark?
- A A U.S. highway
- B An Interstate highway
- C A state highway
- D A county road
Show answer
B. An Interstate highway
The red, white and blue shield is used only on Interstate routes. Each route system has a distinctive shape and color so you can tell them apart quickly. Interstates are listed first when routes share a road.
Source: MUTCD 11th ed., page 256
Related signs
U.S. route marker
State route markerAll road signs · Road sign flashcards (free)