ThinkabaraInterstate Route Shield sign
Guide & service signs · MUTCD M1-1
What it means
You are on, or the arrow points to, an Interstate highway.
How to recognize it
Red, white and blue shield with a number.
What drivers do
Odd numbers run north–south (like I-95); even numbers run east–west (like I-80).
For kids walking and biking
People on foot and on bikes are not allowed on most Interstates.
Check yourself
Interstate highways with even numbers usually run…
Learning summary, not legal advice. Traffic laws vary by state — check your state driver's handbook. Drawing: our own illustration of the standard MUTCD design.
Frequently asked questions
What does the Interstate Route Shield sign mean?
You are on, or the arrow points to, an Interstate highway.
What should a driver do at a Interstate Route Shield sign?
Odd numbers run north–south (like I-95); even numbers run east–west (like I-80).
What does the Interstate Route Shield sign look like?
Red, white and blue shield with a number. It is a guide & service sign (green, blue). MUTCD code M1-1.