What driving maneuver is prohibited while another vehicle is making a left turn?

When another vehicle is making a left turn, passing that vehicle on the left is prohibited to ensure the safety of all road users. This is primarily because the turning vehicle is likely to swing wide or may not be able to clearly see other vehicles approaching from behind. If a driver attempts to pass on the left while the other vehicle is turning, it can lead to a collision, especially if the driver making the left turn does not see the passing vehicle.

Additionally, it is important to consider that the vehicle turning left may need to give way to oncoming traffic or pedestrians, further complicating the maneuver if another vehicle is trying to pass at the same time. Therefore, adhering to the rule against passing in such situations is critical for safety and compliance with traffic laws.