T Intersection Sign
MUTCD W2-4
The road ends ahead at a T intersection; prepare to turn.
What it looks like
A yellow diamond warning sign with a black T-shaped symbol showing that the road ahead ends at a T intersection.
When you'll see it
It appears where the road you are on dead-ends into another road, requiring a turn either left or right.
What to do
Slow down as you approach and prepare to turn left or right; you cannot continue straight ahead.
Related signs
Source: Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition — FHWA.