Under what condition should a three point turn be used?

A three-point turn is an effective maneuver used to change direction when the road is too narrow for a U-turn, and it is particularly utilized when there are no driveways or alleys available to facilitate a turn. This situation necessitates the use of a three-point turn since it allows the driver to safely complete the turn in a confined space without the option of simply pulling into a larger area or turning around. By performing the three-point turn, a driver can turn the vehicle around using minimal space, demonstrating control and awareness of their surroundings.

In contrast, turning at intersections with traffic lights or in high pedestrian areas typically requires other turning methods that are safer and more considerate of pedestrian traffic. Similarly, executing a three-point turn in heavy traffic can be hazardous and may lead to congesting the flow of traffic or creating unsafe conditions. Thus, the ideal scenario for performing a three-point turn is when there are no alternative spaces to execute a turn, making option B the appropriate choice.