Parking lights may only be used:

Parking lights are designed to be used when a vehicle is parked in a location where it could be a hazard to other drivers. Their purpose is to increase the visibility of the vehicle, making it clear to others that the vehicle is stationary. This is particularly important in low-light conditions or on narrow roads where parked vehicles might not be easily seen.

In contrast, using parking lights while driving could lead to confusion for other drivers, as they may assume that the vehicle is parked or stopped. Similarly, while they may provide some visibility in inclement weather, such as fog or heavy rain, using them while driving does not comply with traffic regulations, which typically require the use of headlights instead.

Lastly, when towing a vehicle, specific lights are necessary to indicate the towing situation, and parking lights would not adequately convey that information to other drivers. Therefore, it is essential to remember that parking lights are strictly for use when the vehicle is parked, ensuring safety and clarity on the road.