Re: Pfft! Stupid meat bag!
a) lidar still needs to be able to see the sandbags - which it did, but only after trying to make two lanes out of two.
b) the car has been programmed to ease traffic flow - that does mean asserting priority at times, else the whole system shuts down...
So it understands priorities and common behaviour (in this case making the lane into two lanes on approach to a junction is apparantly common practise, mostly because the American't can't paint - or don't stop at red lights... ;) )
So it started the two lane manouvre, as would a human, then had to stop - and pulled back into a gap in the traffic. Note that the traffic was still in it's own lane - so it could reasonably determine that it had priority in this situation. The bus driver either assumed it was parking or didn't give a monkeys about priority - we'll probably never know which.