When police are summoned to a car crash, the responding officer talks to those involved, surveys the scene, and completes an accident report. This report usually contains the opinions of the investigating officer, as well as detailed information about the accident, including:

• Time, date, and location
• Relevant weather and road conditions
• Makes, models, and license plate numbers of the involved vehicles
• Contact information, insurance information, and statements from involved drivers
• Contact information and statements from passengers and witnesses

Though police accident reports aren't admissible in court for the purpose of proving negligence, they can still provide crash victims.