I think there's a solid chance that a 'near human capable' driving system will handle slippery roads better than the human average. The system will be in a modern vehicle with traction control and likely make conservative judgments about road condition.
There might also be differences in how accurately a human or machine can model which maneuvers can/can't be done without losing traction. I could see this going either way. Maybe a human will be able to identify spots (like puddles) where traction will be especially bad, but a machine can do a detailed physics simulation of a maneuver before trying it.
In whatever way a machine does adjust its behavior for slippery roads, it will probably be more consistent at it than a human. Humans have to deal with force of habit, so for example they may momentarily forget that they can't brake hard or they shouldn't take that turn at a familiar intersection at the same speed as yesterday.
also poor visibility. humans need to rely on their eyes, a car with a bunch of lidar sensors is absolutely going to outperform us in fog, blowing snow, or heavy rain.
