Prayers to the family.
One thing that I'd like to point out that he appeared to be a wheelie fanatic -- something (apparently) surprising for a law enforcement officer. I've never done them personality simply because they kill.
I'm not exactly sure how you run off on a perfectly good highway and launch yourself off of an overpass, (God knows how many feet to the road below) but if stunt riding was the culprit, I hope this incident serves as a wake up call.
I'm surprised that the report did not identify him as law enforcement. Any comment from the law enforcement community as to why this might be so?