When are drivers permitted to use only the parking lights while driving?

Drivers are not permitted to use only the parking lights while driving because parking lights are intended for use when a vehicle is stationary and needs to be visible to others, particularly in low-light conditions. While on the road, it is essential for drivers to use their headlights to ensure visibility for themselves and others. Headlights provide proper illumination of the road ahead and signal a vehicle's presence to other drivers, which is particularly critical in conditions such as darkness, rain, fog, or snowy weather.

Using only parking lights while driving can create a dangerous situation, as these lights are insufficient for safe driving. They do not allow for adequate visibility and may lead other drivers to misinterpret the situation, potentially causing accidents. Therefore, the correct answer emphasizes that there is no scenario under which only parking lights can be used while driving.