Jabberwalker Jabberwalker:
It wouldn't surprise me in the least if the accident occurred because of some design defect in the steering or suspension. GMs best days are way behind them.
Your average driver would be extremely hard pressed to keep a ZR1 straight across an intersection with the PTM off, let alone around a corner at speed.
Granted, experienced or not, that thing can pace in Mode 3. It can pace and make the driver feel active in Modes 4 or 5. It will be very silly to pace if the PTM was completely off, but it does appear to be off in the video.
Far more likely this was a mistake, rather then an inherent defect.