It could have been a single intersection. The article has no useful info. Somehow, the car entered a space where people were standing/laying still stargazing, so, presumably, not the middle of the road. I have definitely seen some more rural areas use both a stop sign and a flashing red light overhead. Sometimes an all-way stop, sometimes one road has a flashing yellow to take the right of way. A leg of a tee would almost definitely get the red/stop while the crossroad could get either, if any sense was used in traffic planning. Leaving the tee via the nonexistent leg could certainly risk a car entering a people space.
Regardless, they are still 3+ separate items that should not have been missed, as you stated. A stop sign, a flashing red light, and leaving the road should all be condemnable as each is a normal circumstance. I'd agree, the speed limit likely did not allow 70mph, either
Right, I wasn't expecting it to read road signs. I guess I was assuming there'd be things along the way it should react to. I used to see subaru aeb testing done with a traffic cone. But, with no details, I should be assuming anything about the presence of objects prior to hitting the people. The Mark Rover video showed the autopilot will continue anyway once the "object" is no longer in sight of the system