When is it appropriate to use hazard lights?

Answer: C — When stopped and temporarily obstructing traffic

Turning on hazard lights to temporarily obstruct traffic is appropriate if it is unavoidable and necessary for safety reasons. This includes scenarios such as a disabled vehicle, an accident, or when loading or unloading passengers. However, using hazard lights during conditions when they are not necessary, such as during foggy conditions or when double parked, can be confusing and hazardous for other drivers on the road. Therefore, using hazard lights should be done only when the situation calls for it, rather than using them as a general safety precaution at all times.