I'd expect cameras to be easier to keep clear in extreme circumstances, actually. The key is the "clear view screen" [1], a circular window on bearings that spi

I'd expect cameras to be easier to keep clear in extreme circumstances, actually. The key is the "clear view screen" [1], a circular window on bearings that spins rapidly to throw off obstructions. You can also heat them to deal with icing. I don't think that I've ever seen a mirror outfitted with one, but cameras are small enough to make them trivially fittable, and the units themselves I'd expect to be surprisingly cheap - armored ten-inch units for CNC enclosures are ~USD1300 even at low volume [2]. I could easily see a configuration that has four or five important cameras covered by spinners and placed so ice can't bridge the panel. [1] https://en.wikipedia.org/wiki/Clear_view_screen https://en.wikipedia.org/wiki/Clear_view_screen [2] http://visiport.com/pdf/VPO-DEU_Unit-Pricing_PL1601.pdf http://visiport.com/pdf/VPO-DEU_Unit-Pricing_PL1601.pdf