: In some states like Oregon, U-turns are prohibited at any intersection controlled by a traffic signal unless a sign explicitly allows it. Conversely, in Texas, they are generally allowed at intersections as long as no sign says otherwise.

: Many cities prohibit U-turns in business districts except at designated intersections. Safe Execution Techniques

The general rule is that U-turns are legal unless a sign prohibits them, but many jurisdictions have specific "hidden" restrictions:

A U-turn is a 180-degree rotation of a vehicle to reverse direction. While common, they are strictly regulated and can be dangerous if performed incorrectly.