They absolutely do run in the fog, I live in a particularly foggy part of the city and take them several times a week.

And SF absolutely does have lots of narrow streets. There are a lot of neighborhoods where the roads are only wide enough for one direction of traffic at a time due to parked cars. Either you or the oncoming car needs to pull to the side in front of a driveway to pass. Waymo handles these situations expertly.

Based on your other posts in here you seem to have some kind of axe to grind and are making stuff up. Go watch some Youtube videos.