If you been involved in a motor vehicle accident and feel that you are not at fault, summoning the police to the scene of the accident is the best to document the event and protect your legal rights.
The police office can make a liability determination and possibly issue a citation to the at fault driver. This will likely cause the other drivers insurance company to approach the claim from the vantage point that their driver is already more than likely at fault. This is certainly helpful, particularly when there is property damage at issue. Moreover, participants will be less likely to be hostile or refuse to provide information if ordered to do so by a law enforcement officer.