I don’t have the nerve to claim I had thought of that. BUT: if you’d have a pro account you could see there’s a small rectangle window in the middle of the switch, and switches of this type often have a bulb behind that window to help people find them.
Again, I cannot be positive that this is the case here. It would be a solution, and the Jenhausen population may have been brighter than me...

LOL don't yours turn on automatically at dusk and off at daylight???

Yes, most of them certainly do, and they burn the whole night long, regardless of traffic passing by.
This is a lonesome road, leading up to a church which will greet you with a collection of sculls. You wouldn’t want to waste too much energy on it, but neither approach it in complete darkness...