I was just in CA for a few weeks and drove in SF quite a bit. There are Waymo cars
everywhere and from the perspective of a driver I was more than a little cautious driving behind or next to one of them.
I would rate their driving as quite good, but their signaling of intent was terrible. More than once did I see them use turn signals, only to never actually turn. Turn the signals on, then off again, then on again, eventually turn perhaps but not always.
Humans are terrible at this too, but we also use more subtle and inadvertent signals like the slight movement to the line telling me they're likely about to switch lanes, only to see the signal go on halfway into it. Those subtle signals are easier to pick up on than a robot driving more or less perfectly straight while signaling, turning of signals, turning them back on again, and so on. Also super creepy with empty driver seats, and no one responsible to make eye contact with.
But the actual driving wasn't bad, as it turns out. Never had or saw a near miss, anything reckless or otherwise remarkable. I can see myself getting used to this tech and I would love for it to succeed, because man driving for anything but fun really sucks.