Final answer:
It is true that using only parking lights while driving at night is unlawful. Headlights must be used to ensure road visibility and to indicate your presence to other road users.
Step-by-step explanation:
True, when driving at night, using only your parking lights is unlawful. This is because parking lights are not designed to illuminate the road ahead but rather to indicate that a vehicle is parked on the road. When driving, you are required to use headlights to ensure that you can see the road, any hazards, and so that other road users can see you. This is similar to the rule which mandates that you must stop at a red traffic light; there are certain situations, such as when a pregnant woman is about to deliver, that might lead one to consider breaking traffic laws in the interest of greater utility, but in general, traffic rules, including those about proper light use, are in place to ensure safety and should be followed.