What type of lights should vehicles use when parked on the highway at night?

Using low beam headlights or parking lights when parked on the highway at night is the appropriate choice because they provide visibility to other drivers while not creating excessive glare. High beam headlights are too bright for this situation and can blind oncoming traffic, creating a dangerous environment. Emergency flashers are typically used to indicate a vehicle that is stopped due to a problem rather than being parked, as they signal urgency. Fog lights, designed for visibility in foggy conditions, are also not suitable for indicating a parked vehicle. Therefore, using low beam headlights or parking lights ensures that a parked vehicle is visible to other drivers without impairing their ability to see the road.