Bump Sign
MUTCD W8-1
There is a bump in the road ahead; slow down.
What it looks like
A yellow diamond warning sign with the black word BUMP or a raised-pavement symbol to warn of a bump in the road ahead.
When you'll see it
You meet it before a sharp rise or rough spot in the pavement, such as a railroad hump, patched surface, or speed hump.
What to do
Slow down before the bump so you can cross it smoothly and keep control of your vehicle.
Related signs
Source: Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition — FHWA.