What action should be taken during hours of darkness or inclement weather for vehicles parked on the ramp?

Using parking lights or emergency flashers is the appropriate action to take during hours of darkness or in inclement weather for vehicles parked on the ramp. This practice enhances visibility and safety, allowing other vehicles and personnel to easily identify the presence of parked vehicles.

Parking lights and emergency flashers provide a warning signal, which is crucial in low-visibility conditions to help prevent accidents. They alert others to the vehicle's location, particularly on busy ramps where movement may be erratic.

In scenarios where headlights are used, they can be misleading as they may indicate that the vehicle is active and ready to move, which can lead to confusion for nearby personnel and drivers. Leaving vehicles unlit poses a significant risk, as unlit vehicles can blend into the darkness or adverse weather conditions, making them difficult to see. Skipping parking entirely is not a practical solution in every context, as operational requirements may necessitate the use of parking on ramps during these times, stressing the importance of proper illumination when parking.