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... The cars drive conservatively, but they can get confused in edge cases"earlier this month, Waymo issued a recall to fix a problem in which its robotaxis would illegally pass stopped school buses. ...

When the traffic lights went out, Waymo's robotaxis got a little too cautious at intersections. With no red-yellow-green to cue drivers, the rule is to treat the intersection as a four-way stop. Indeed, Waymo's cars are programmed to do this, but it seems the scale of the outage over the weekend was just too much to handle.

Social media and Reddit began to fill with videos of stationary Waymos at intersections, and the company temporarily suspended service. ...