A stop sign.
which sign tells you to slow down because you are approaching a double curve in Texas?
yield sign
Yellow diamond with a black "S"
The one that looks like an S
The one that looks like an S
The yellow S curve sign
That would be a double curve, it would be a black "S" on a yellow diamond shaped sign.
An 'S' sign.
Advisory sign
yellow flashing lights Yellow rhombus (diamond) with curving line and arrow.
That would be a diamond yellow sign with an "s" shaped arrow in the direction of the turns (in the U.S.)
Yellow diamond with a black "S" arrow