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The safest thing might be for the car to pull over, put on hazard lights, and tell you to wait or call for assistance.

Humans deciding to go continue driving in such conditions is a mistake, leading to more collisions. Perhaps there will be a manual override, like "Unsafe conditions, voice password and waiver required to continue in manual mode; you might die or kill someone else."

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Once you get into bad snow conditions pulling over is a really bad option. That said, this is a corner case I care less about than crossing Manhattan in rain at rush hour. Or really lots of tricky busy off-highway situations.

Self-driving car can go slower in those cases. It depends entirely on how beefy its CPU/GPU is to process a lot of sensor data realtime. The more messy situation is, the more time it needs, the slower it needs to drive.

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