I was in SF recently and got stuck behind a self driving car that was trying to turn down a closed street. The street had a police barrier up and it just sat there with its blinker on waiting for the street to open up. Meanwhile, everyone behind it is stuck there waiting for it to make a turn that it would never be able to make.
Eventually, after sitting in traffic for ten minutes, not knowing what was up, cars in front of me started to move around it and then I realized what was going on. I understand why people hate these things.