When is it legal to pass another vehicle on the right?

Answer: A — When the vehicle is making a left turn

Passing another vehicle on the right is legal in Illinois when the vehicle in front of you is making a left turn. This situation often occurs when the vehicle you are following is signaling or has slowed down to turn left at an intersection, allowing you to safely maneuver around it on the right side. In addition to this situation, it is also important to note that vehicles may generally pass on the right when there are designated lanes that allow this maneuver. However, simply passing on the right should always be approached with caution and consideration for safety and traffic regulations. Other options may highlight specific circumstances or restrictions, but it is the scenario of a vehicle turning left that is a clear and commonly recognized situation in which passing on the right is permissible.