The Fontana Police Department is the primary law enforcement agency in the city and will likely respond to the scene of the accident. When interacting with the police, it is important to remain calm and cooperative, as this can help ensure a smooth and efficient process. Be sure to provide the officer with your driver's license, registration, and insurance information. It is also important to ask for a copy of the police report, which can provide valuable information about the accident and may be necessary for filing an insurance claim or legal action.