Hill / Steep Grade
- Shape
- Diamond
- Color
- Black on yellow
- Meaning
- A steep downgrade is ahead.
- Required driver action
- Select a low gear before the grade and use proper braking technique.
- CDL relevance
- Often paired with a percent-grade plaque and truck instructions.
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.