All in all, it is a serious matter. Being able to get out of your car seems pretty obvious, but wait until it is overturned.
I had a friend racing with Mazda Motorsports a few years ago in the 25 hr enduro at Thunder Hill. About 2 am, he tangled with a Cobra and both went cartwheeling, no, the Mx5 ran into the back of the Cobra in a high speed sweeper turn. When everything stopped, the Mx5 was laying on the drivers door and it was dark. He had a broken thumb, left hand and was able to climb out the passenger side window.
My point is this, excercising the ability to remove ones carcus from the race car in tech should be easy, uncomfortable if 100° out, but, easier than say on fire or inverted or in the dark. I know that LSR doesn't run at night, bounce around and have vertigo, may as well be dark.
Now, the fact that I could not fit out the window of a Miata inside the trailer, now that was pure entertainment. My Wife reminds me repeatedly.
J