When there is an agreement between the two parties regarding the accident liability, the following actions must be taken: -Fill out the CID form also called CAI. The following data must be indicated in the form: date and time of the accident, data of the respective cars, data of the vehicle owners, the dynamics of the accident. Remember to sign the form. - Send the CID or CAI form to the insurance company notifying that the accident has occurred. If an agreement is not found with the counterpart on the dynamics of the accident, the law enforcement agencies must be called to draw up a road accident report based on the statements of the people involved and the relevant findings. If you don't speak Italian well, you should always ask for police intervention. At this link you can download the CID form http://cartraveldocs.com/