Here is a different not-so-lethal in the end incident of Gurdjieff's car smashing against a tree.
[quote author=Gurdjieff and The Women of the Rope]
Friday May 14, 1937
Miss Gordon telephoned that he (Gurdjieff) had telephoned from Cannes that "something was" with his car, and that he was taking the train. This noon, still in pajamas and typing, he sent me word he was downstairs. I threw on topcoat and descended. He was pacing up and down, his arm in a sling. Before explaining, he asked all about each patient to whom I had been giving piqûres in his absence. Then he said he had left his car on a steep Alp, engine off, handbrake only holding, while he went to look at the view. In the car there was a woman and children. Suddenly the car moved forward toward the curve and precipice. With one gigantic bound - "never was my brain so quick" - he leaped on the running board, put his arm inside, and steered the Buick straight off the road downhill to the only tree in sight. The car was smashed to bits, but the occupants were saved. He was thrown into the air, turned over several times and fell on his shoulder. "Almost all was finished; me, my work, all of you".
pg156-157
[/quote]
Before his passing in 1949, Gurdjieff had another serious car accident in 1948. He suffered severe internal injuries in that crash.
From different accounts, Gurdjieff apparently drove quite recklessly. He apparently taught himself driving. Here is Kathryn Hulme, one of the "women of the rope" reminiscing
[quote author=Kathryn Hulme]
He drove like a wild man, cutting in and out of traffic without hand signals or even space to accommodate his car in the lanes he suddenly switched to . . . until he was in them, safe by a hair . . . he always got away first on the green light even (so it seemed) when he was one or two cars behind the starting line . . . the chances he took overtaking buses and trucks were terrifying. I watched with suspended breath each time he swung out around a truck and headed directly into another coming toward him on the narrow two lane road.
[/quote]
Fritz Peters recounted similar accounts where Gurdjieff would drive on the wrong side of the road and would not check for gas or carry enough gas so that the car unexpectedly came to a halt in the middle of the road.
So, even if his accident had a "hyperdimensional" element, Gurdjieff's antics with the car significantly increased the chances of something going wrong on the road.