Reverse curve sign
A curve to the right, then to the left.
MUTCD designation W1-4R. See the federal MUTCD, page 194.
How to read signs like this
Warning signs are usually yellow diamonds. They tell you about a hazard or change ahead (curves, intersections, merges, slippery roads) so you can slow down before you get there.
Related signs
All road signs · Road sign flashcards (free)