Snow (maybe not a foot but enough to at least cover the lane markings), black ice and sand drifts people experience every day in the normal course of driving, s

Snow (maybe not a foot but enough to at least cover the lane markings), black ice and sand drifts people experience every day in the normal course of driving, so it's reasonable to expect driverless cars to be able to handle them. Forest fires, tsunamis, lava flows, and tornados are weather emergencies. I think it's a little more reasonable to not have expectations for driverless cars in those situations.