Moved to a stepdown unit today.
Back brace in place purely as a preventative. Twice daily visits from the respiratory therapist to make sure he is recovering breathing capacity at the expected rate. Low addiction-potential pain pump in place in lieu of rhino tranquilizer. Beginning discussions of how to begin rehab and physical therapy.
A visit from the police officer who was first on the scene. Two other cars involved in the crash. He was hit by a Tahoe doing about 65 MPH. Both of the other drivers are fine, their cars are scrap. He was the one at fault via 'too fast for conditions.'
I don't know what is next.