If you listen to the video of the interaction with the police officer and the two Waymo guys, it’s clear to me he’s not making anything up about the events that took place. The car did run through the intersection when he turn on the light. He’s not trying to issue tickets or anything - he really is interacting with the Waymo people to let the know “your car was behaving erratically. It needs to be off the road”. Its very possible the road construction uncertainty plus being in an oncoming traffic lane plus being lit up by the police triggered some very specific failure of process in the code.