As I undertand the thread/circumstances surrounding Marks death they were numerous severe injuries to the "body" and face. The cause of death seemed to center on a broken neck. The car was reported to have rolled more than once, possibly more than twice. From the pictures following the accident it appears that there is "not that much" damage to the car itself. Therefore I SPECULATE that the car flipped and rolled at least once in the AIR. Massive G forces would have been exerted at the time.
The passenger (his fiance), of slight build and frame, was ejected from the car EVEN though she was wearing a five point belt! According to the thread Mark was a fanatic about himself and his passengers "buckling up". He was in fact strapped in tightly after the accident.
It does not appear in any of the pictures I have seen that he had a "head rest" on the roll bar or the seat. Did this contribute and/or cause the broken neck? I don't know, but it does make one wonder, "What if".
Again it "appears" from the pictures that the cause of the "roll over" was striking the right hand side of the road embankment. A fairly smooth "ramp" like dirt structure, perfectly suited for "launching" the car into the air. An accident of this nature COULD occur from several different scenarios.
Getting distracted at speed and letting the car "wander" off to the side.
Accellerating hard and having something "break" causing the car to swerve suddenly to one side.
Just driving "conservatively" and having something break and the car swerving suddenly.
Accellerating hard and having the rear end break loose, over reacting and running off the road.
Getting "bumped" by the car you are "racing", from the rear or the side and loosing control as a result.
Well, think about it. I'm sure there are plenty more reasons for an accident of this nature to happen to ANY of us "good, conservative, paying attention" type drivers.
The "likely hood" of such an accident? Probably "rare" considering the miles driven, the number of cars on the road, etc. I use a ONE hoop roll bar. I DID have a head rest, which I REMOVED so my seat will go back farther. I drive on the street and race at the track and accept the "risk" in favor of driver "comfort" and "looks". Foolish? Maybe, sometimes I wonder................
Ernie