Whether it is necessary to call the police for a traffic accident, even if no one is injured, usually depends on the specific circumstances of the accident and local regulations. Generally speaking, you need to call the police even if there are no casualties in the following situations： - The vehicle is severely damaged -Involving damage to public property (such as street lights, guardrails) -One or more parties cannot agree on responsibilities -Someone is suspected of drunk driving or other illegal acts -There are vehicles that cannot drive normally and need a trailer -Situations where local laws require the police to be called If it is a slight scratch and the two parties can resolve it peacefully, some areas allow the parties to exchange information on their own and resolve it privately. For safety reasons, it is recommended that you understand the specific local traffic regulations, and it is best to call the police when you are not sure, so as to facilitate insurance claims and avoid follow-up disputes.