I would expect service to be canceled while it is pouring down. Do we have reasons to believe that they have the ability to ride safely during heavy rain? I haven't been keeping up.
From their August 2023 blog post:
> During this past winter season in California with its record rain, high winds, and thunderstorms, we were able to maintain 99.4% fleet uptime
A machine driver should not accept these conditions.
It happens rarely. When it does, more cautious drivers give up and pull over, even if they are on the freeway. That makes travelling at high speed down on freeway at high speed in those conditions near suicidal.
It only lasts a few minutes. I expect Waymo would handle like any human. Stop, or just creep forward.
So if it's too dangerous for people, it's also too dangerous for computers.