Interstate Route Marker
- Shape
- Shield
- Color
- Red, white and blue
- Meaning
- Identifies an Interstate highway.
- Required driver action
- Use for navigation.
- CDL relevance
- Even-numbered interstates run east–west; odd-numbered run north–south.
Source: FHWA — Manual on Uniform Traffic Control Devices (MUTCD) (11th Edition (December 2023)). Sign images are original simplified illustrations for study, not official MUTCD artwork.