They won't show unless there is injury. If you're bruised, then you're injured. You need to get a police report. If they won't come out, then you're dazed and it hurts to move. Anything to get them on the scene to do the report. I have a friend who even with the report, broken shoulder, car at fault is fighting the insurance company in court now because they weren't wanting to pay for his medical bills in full, and only wanted to give him a couple hundred for a Dura Ace equipped bike. He has police reports and everything and they're still trying to shaft him. He just wants his medical covered and the bike replaced. Now it's medical, plus lawyer fees, etc... When you get into a situtation like this, the key is documentation.
Mark