Calling the police, even if your state doesn't require you to, is a good idea. Often, the police will write a report of the incident, which may help establish the facts of the case. The officer can also help at the scene with traffic flow problems. Also, the officer may be able to determine if anyone was driving recklessly or under the influence of drugs or alcohol.
In some areas, the police won't write a report when the accident takes place on private property, like most parking lots. This is when you need to take careful, detailed notes of the accident details.
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