To officially report a traffic accident, you need to contact the Chicago Police Department at the time of the incident. If the accident is an emergency, then dial 911. Otherwise, you can contact the police on their non-emergency line. When police come to the crash scene, they will create an official traffic accident report.
If you’d like to get a copy of your police report, then you can contact the Chicago Police Department Records Customer Service Section Monday through Friday at (312) 745-5130.