Collect and keep safe evidence proving your position. This guide discusses what to do after an accident and what to expect when you file a claim with your insurance company.Gather evidence and contact information. To file a lawsuit in the LASC, you will need to complete a complaint form and pay the required filing fees. Even if you don't believe that you or the other party has any injuries, call the police. In many cases, the police will respond and fill out an accident report. You will be required to fill out and submit a Report of Traffic Accident Occurring in California, which is also known as an SR-1. If possible, collect the driver's contact and insurance information as well as the names and contact information of any witnesses. Gather information about the vehicles and drivers involved. This includes the license plate number, year, make, model, and color of vehicles.