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You can’t see from the video but I suspect the police car had tuned off it’s lights which caused the driverless car to proceed as normal, but then it pulled over again when the police car tuned them back on again.

You’d expect a driverless car to pull over to let emergency vehicles pass, not to actually be stopped by them.

"Why were you running? Because you were chasing me"

Is it possible the car was given instructions to do that, to get out of the way of traffic? The place where it is initially is awkwardly near a "parklet" (outdoor dining area in a former parking spot) as well as right at an intersection and fire hydrant.