When is a U-turn permitted and necessary?

• When you miss an exit on a highway
• At an intersection where left turns are prohibited and you need to use a median opening
  Explanation:

  "U-turns are permitted and necessary at an intersection. Left turn movement is prohibited in the intersection itself, and the left turn is made after the driver proceeds through the intersection and makes a U-turn at an upcoming median opening."
• In the middle of a busy road
• Anywhere as long as there are no pedestrians