Which of these statements is incorrect?

You needed to find an incorrect statement: it's 'Always make a U-turn at a location that is marked with a no U-turn sign.' In fact, you should only make a U-turn when it is safe. U-turns should not be made on any curve or near the crest of a hill when your vehicle may not be seen by other drivers. Some towns and cities do not allow U-turns. Never make a U-turn at a location that is marked with a no U-turn sign or at an intersection controlled by a traffic signal or police officer.