When is it acceptable to drive with just your parking lights on?

Answer: C — Never; you must use headlights when required

Driving with only your parking lights on is never acceptable when operating a vehicle on public roads. Parking lights are not designed to provide adequate illumination for driving; they are intended to make a parked vehicle more visible to other drivers. When visibility conditions require the use of headlights—such as during nighttime, in inclement weather, or on poorly lit roads—you are legally obligated to use your headlights instead. This ensures both your safety and the safety of others by providing the necessary visibility needed for driving.