A light idea
Taking the dog for a walk just on dusk I walked past a neighbour’s house. His car was parked in his driveway with the lights left on. I knew he’ll get a flat battery, so I knocked on his door and alerted him.
The same scenario often happens as we drive past a vehicle whose lights are blaring. I must admit I don’t stop my car often to save the owner from a flat battery.
But why not toooot, toooot, toot, toot, toot?
What I mean is this: As I see someone in this predicament (lights on without a driver in the car) I blow my horn 5 times -two long and three short toots. Anyone hearing this signal then thinks: "Is that for me? Did I turn my lights off?"
It may just save someone from getting a flat battery.