thumb|right|A diagram showing the path of a driver performing a U-turn on a normal two-way road (left-hand traffic) thumb|Contrail of a plane that took a U-turn A U-turn in driving refers to performing a 180° rotation to reverse the direction of travel. It is called a "U-turn" because the maneuver looks like the letter U. In some areas, along with most intersections where so indicated, the maneuver is illegal, while in others, it is treated as a more ordinary turn, merely extended. In still other areas, lanes are occasionally marked "U-turn permitted" or even "U-turn only."
thumb|right|A diagram showing the path of a driver performing a U-turn on a normal two-way road (left-hand traffic) thumb|Contrail of a plane that took a U-turn A U-turn in driving refers to performing a 180° rotation to reverse the direction of travel. It is called a "U-turn" because the maneuver looks like the letter U. In some areas, along with most intersections where so indicated, the maneuver is illegal, while in others, it is treated as a more ordinary turn, merely extended. In still other areas, lanes are occasionally marked "U-turn permitted" or even "U-turn only."
Occasionally, on a divided highway, special U-turn ramps known as turnarounds exist to allow traffic to make a U-turn, though often their use is restricted to emergency and police vehicles only, and if used by passenger vehicles, are specifically limited by authorities to controlled slow-speed and flagger-directed turnarounds away from an incident or closure.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).