Thanks! Here is the NTSB report from the Mountain View accident:
https://www.ntsb.gov/investigations/AccidentReports/Reports/HWY18FH011-preliminary.pdf
Since the cruise control speed was set to 75 mph, acceleration from a slower speed makes sense. It happens all the time with dynamic cruise control when a lead vehicle changes lanes and the road is free.
The symptoms suggest the car uses painted lines to detect the lane boundaries and has inferior obstacle detection. Our Prius Prime has a radar based, object detection. In spite of the short range, it works great in the 30-35 mph range. At higher speeds, it does not detect objects soon enough to reduce the speed.
The Toyota system has lane departure alert which is an audio and visual notice. It does make a single, weak attempt to steer towards the lane, it by no means is trying to follow the lane. But it too is dependent upon the quality of painted lane lines.
The "gore" is the triangular area before the barrier. This is where rumble strips are needed to provide a vehicle independent signal of the hazard. Painted lane lines are unreliable.
Bob Wilson