Hill sign
A yellow diamond with a truck on a slope. It warns of a steep downhill grade ahead.
Rules vary by state and country. This explains the sign's standard meaning in the U.S. Manual on Uniform Traffic Control Devices; it isn't legal advice.
How to read it
Despite the name, the sign is about going down: the MUTCD places it ahead of downgrades long or steep enough to call for special care. Its guidance gives examples, from a 5% grade more than 3,000 feet long to a 9% grade more than 500 feet long, and a plaque below the sign can give the grade.
More road signs
Sources
- MUTCD 2009 Edition, Chapter 2C: Warning Signs and Object Markers, MUTCD 2009, Part 2, U.S. Federal Highway Administration, Section 2C.16
- Pennsylvania Driver's Manual, Chapter 2: Signals, Signs and Pavement Markings, Pennsylvania Department of Transportation, p. 16
- Official Florida Driver License Handbook, rev. 08/2023, Florida Department of Highway Safety and Motor Vehicles, p. 51
- What Every Driver Must Know, Michigan driver manual, Michigan Department of State, Chapter 5, sign 51
Last reviewed September 25, 2026 by Rory Hansen. How we research