Curve Ahead
- Shape
- Diamond
- Color
- Black on yellow
- Meaning
- The road curves ahead.
- Required driver action
- Slow down before the curve.
- CDL relevance
- Posted advisory speeds are for cars; trucks should go slower.
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.