Sorry about the accident, but it might help if you could get a police (or fire/paramedic) report on the accident. Call the local police and ask them what you need to geta report - date, time, location, etc. PRobably cost a few dollars, but might help put the focus of what happened. While you state it was a hit-&-run, the investigating cops might have found some evidence/witnesses that could shed a little light on what might have caused the accident; low angle sunlight, driver making an illegal turn, driver cutting off your friend on the bike, running a red light/stop sign, or even you friend making an illegal move on the bicycle (gotta face the fact that this is a possibility). It'll help you figure out if the area is really dangerous or if it was really an unfortunate random occurance.