Has much thought been put into driving in poor road conditions? It seems in the cities self driving cars are pretty much ready, but I wonder about how they will

Has much thought been put into driving in poor road conditions? It seems in the cities self driving cars are pretty much ready, but I wonder about how they will be in bad snow/ice/hail/wind conditions. Humans are pretty bad at these conditions as well. I see a scenario that the self driving cars have X fatality rate which seems very high, while nobody believes the human fatality rate which is even higher.