I believe that that accident happened roughly between the mobile seating area, and the end of the spectator area, the car travelled across from the far lane after the steering wheel had become detached!
Myself and Satty "Mr Blue" had been spectating in that immediate area, only moments earlier, and had already questioned the safety after that mega quick white Mk1 went past us and blew up...
Water barriers, then concrete barriers are needed for that first 200 yards of spectator area, and "on the line" Scrutineer's needs to be a lot sharper!
I wish a speedy recovery to all involved
Thom