Here's an even stranger one. I was driving in bright sunlight late one afternoon, albeit with the sun very low in the sky behind me and my headlights came on. Now I know according to Police roadcraft and advanced driving techniques that this is good practice, so thought no more about it. However, a bit futher down the road, with the direct sun nowhere to be seen and the road shaded by trees, the lights turned off.
Now, is the light sensor for the dimming mirror comparing notes with the forward facing sensor in the windscreen and between them they are deciding that I should adopt advanced driver headlight opperation?