Loose Gravel Sign
MUTCD W8-7
Loose gravel is on the road ahead; slow down.
What it looks like
A yellow diamond-shaped warning sign with a black symbol or the legend LOOSE GRAVEL showing stones kicking up from a wheel.
When you'll see it
On roads recently surfaced with chip seal or where gravel has spread onto the pavement, common on rural and freshly maintained roads.
What to do
Slow down to keep control; loose gravel reduces traction and can be thrown by tires, so leave extra distance from vehicles ahead.
Related signs
Source: Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition — FHWA.