Divided Highway Ends Sign
MUTCD W6-2
The divided highway ends ahead and becomes a two-way road; keep right.
What it looks like
A yellow diamond warning sign with a black symbol showing two separated lanes rejoining to indicate the divided highway ends.
When you'll see it
It appears where a divided highway ends and traffic returns to a single two-way road with oncoming vehicles.
What to do
Keep right and be prepared for oncoming traffic as the median ends and the road becomes two-way.
Related signs
Source: Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition — FHWA.