The kid took a turn too fast, scared himself, let off the throttle, and went off-roading. Does not have his license, yet, whomever the licensed driver was should have slowed him down. That having been stated, I have driven that turn, myself. From a 60 MPH state highway, you exit to a 30 MPH ramp, and everything seems fine. About halfway through the turn to the interstate, the radius of the turn decreases dramatically, and continues to decrease. If you're going too fast, only skill will save you, at that point. I briefly let off the throtyle, my first time through there. My Fiero was on old tires, and old suspension, at the time. When I let off the throttle, the rear end started to come around. I powered out, got the Fiero straight, and merged at a much higher rate of speed than planned. Since this is a flat banked turn that goes up to the interstate, the other options are to come off the turn into the lower ground between, to drive straight across the interstate traffic.
The kid came off the turn, and hit the ground nose-first.
Whomever the licensed driver was, no beginning driver should be on that turn. The engineering of the turn is bad. When I drive by there on the interstate, I avoid the right lane, because the interstate also goes around a right turn there, and foliage hides merging traffic, meaning that vehicles running 20 MPH are dumped onto the highway, to the surprise of the 60 MPH traffic. Lots of accidents there.
I imagine the Fiero is toast. The AC and coolant radiators, front frame rails, bumper, fenders, various suspension components, the hood... I'm just guessing, from his description. He says underbody damage.