Signal Ahead
- Shape
- Diamond
- Color
- Yellow with signal symbol
- Meaning
- A traffic signal is ahead.
- Required driver action
- Be ready to stop.
- CDL relevance
- A heavy truck needs more distance to stop at a light.
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.