When should you activate your vehicle's warning lights?

Answer: B — When stopped on the road

Activating your vehicle's warning lights is crucial for safety, particularly when stopped on the road. These lights signal to other drivers that your vehicle is not moving and may be a hazard, especially if it's in a location that could obstruct traffic. This alert helps to reduce the risk of collisions by ensuring that other motorists are aware of your presence and can navigate around you safely. In contrast, while it is important to be visible while driving at night or when approaching intersections, those situations do not specifically require the use of warning lights unless there is a need to signal a hazard or unusual circumstance. Similarly, while turning at a traffic light may require indicating your intention to turn, this is typically done using turn signals rather than hazard lights.