Any amount of snow would do this too. It severely reduces the color space of road features.

Tesla cameras are not RGB, they're WWWR (white-white-white-red). Essentially they have a Bayer array, but only for 1 red pixel out of four, the other three are black & white. I believe that the W pixels aren't homogenous either, there is some design aspect that enables them to cover a wider range of intensities so that they can handle both darkness and full sunlight.