[AngryData]

I would dispute saying it is almost always bad practice. Sometimes it is, people do dumb stuff, but in many cases it solves problems before they become a problem to start with because most humans are pretty good at predicting how others around them will react.

Stopping in the middle of the road to save a pedestrian 3 seconds while costing 5 cars on the road to wait 10 seconds is obviously dumb, but what about recognizing the gap near you in the line of cars is the only gap around for the pedestrian waiting ahead, and either slowing down or speeding up a little bit to open that gap wider which makes everybody safer and eliminates any real braking events.

You might not notice all the things people do now to make traffic move smoothly, either intentionally or not, but something as simple as a line of robot cars spreading out on a road can cause problems when traffic levels that normally leave large gaps for easier left turns, pedestrians, poor visibility crossings, etc, instead becomes a steady spaced stream of traffic that has to be disrupted to fit those other options. Very small things can result in large traffic bottlenecks. Humans aren't immune to it, we cause out own problems with things like traffic waves, but we also solve many problems ourselves without really thinking about it.