Traffic Light Thought–We need a “turn your headlights on” signal

Maybe it is the season, winter gloom approaches, or just the time of my evening commute?

Every night I see several cars with no headlights, barely visible in the dark. It can be easy to overlook if you drive out of a brightly lit car park on to the lit city street. Sometimes, especially when roads are wet, it can be hard to tell if your lights are on at all!

There seem to be accepted signals for thankyou (couple of hazard light flashes), caution (headlight full beam flash) but no way to jut say “turn your lights on”. I’ve tried multiple headlight flashing but only seen limited response to that. Any better ideas?