Hope your friend has a speedy recovery, Rog...
I saw another rider go down a few months ago, and made me much more aware of another potential trouble spot for us as riders...approaching an exit ramp on a three lane interstate, rider was in right hand lane, but not exiting...cage was in middle lane, decided she wanted to exit, clipped the bikes front end when she tried to go accross his lane, and onto the exit ramp. Guy never had a chance to even get on the brakes. Bike slid about 300 feet...rider came off, had some bad road rash, a few cuts on his forehead (had on a DOT half helmet), lost his shoes (was not wearing boots) so his feet were messed up pretty bad.
So now I make damn sure when approaching exit ramps that the cars around me know I'm there, I stay out of their blind spots, or manuver into a lane where this won't be an issue.