Since I've been PTSD since I was 6 months old or so, even though I was not diagnosed until somewhere around the year 2000, my car accident in the 1990s was definitely PTSD related. I'm 58 now. I'd gotten lost and was in a panic trying to find my way back to where I'd last known where I was or back to the highway I'd exited, whichever came first. After that point, I'd even panic if I had to go to someplace where I was unfamiliar with the routes. I chose all means of getting out of it!
In the accident, there was a sudden snow squall, and then right after that, a bus stopped in front of me. I had plenty of room to stop, but slammed the brakes on, which I knew better than to do under such conditions. Mindlessly, in panic, I kept the brake all the way down instead of tapping it, which I also knew better than to do. I rammed into the bus at maybe 5 miles an hour, after sliding some 30 feet. My car was totaled, believe it or not, because the bus' bumper was higher than my front end and the car slid under it.
So I answered that I'd had 1 accident after PTSD.