That's the place. Traffic accidents When you encounter traffic accident on the road, keep the scene until police arrives. The police also writes down both's statements. You have to pay attention when you are asked what happened because the statement is important to figure out whose fault. The police finally gives you and opponent a case number.
Insurance companies deal with traffic accidents.
If the accident is your fault, you should submit a police report into your insurance company in a few days. If opponent's fault, you should submit it to opponent's insurance company. The Police Department keeps police reports. You can get your police report with case number at the police department. You can get the police report without the case number.