When is it illegal to pass another vehicle?

Answer: B — At intersections and on bridges

Passing another vehicle is illegal at intersections and on bridges primarily for safety reasons. Intersections are high-risk areas where vehicles are likely to be making turns or crossing paths, which can lead to accidents if a driver attempts to pass in those zones. Additionally, bridges can present a narrow space where visibility is limited and maneuvers may be restricted, making it dangerous to pass another vehicle. In contrast, while it may be regulated in residential areas and multi-lane roads can have specific rules about passing, the law strictly prohibits passing in these critical areas to minimize the risk of collisions and to ensure the safety of all road users. Traffic lights also dictate when it's safe to move forward, but their relevance to the act of passing does not equate to a blanket illegality in those situations.