Where is it sufficient to use your parking lights while your car is parked on an unlit roadway?

You answered correctly. In Germany, when parking on an unlit roadway inside built-up areas, it is sufficient to use only your parking lights. This is because street lighting and slower speeds in these areas generally reduce the risk of accidents. However, outside built-up areas or on the hard shoulder of autobahns, you must use your low beam headlights instead of just parking lights to make your vehicle more visible and ensure safety, as these places are darker and vehicles travel faster. Remember: use only parking lights when parked in unlit sections inside towns or cities, not outside them or on autobahns.