U-turnUnited Kingdom
1. U-turn
A U-turn is a driving manoeuvre in which a vehicle turns around to travel in the opposite direction. It normally involves crossing part of the roadway and re-entering traffic facing the direction from which the vehicle came.
Before making a U-turn, the driver should check surrounding traffic, pedestrians and cyclists, signal when required and make sure there is enough visibility and space to complete the manoeuvre safely. U-turns may be prohibited by traffic signs or on particular types of roads.
What does the UK Highway Code advise if you need to turn around?
Find a safe place, preferably away from a busy road. Rule 200 suggests using a quiet side road or driving around a block rather than reversing or turning round where busy traffic makes it hazardous.

Traffic rules
United Kingdom