Legal analysis: No, the case can be closed if one party to the traffic accident does not sign. Mediation is not applicable if the other party refuses to sign. The traffic police can state the relevant circumstances on the road traffic accident determination letter and send the road traffic accident determination letter to reach the parties concerned. The legal representative of the party concerned. When the party involved in the accident is a person without capacity for civil conduct or a person with limited capacity for civil conduct, his legal representative may file an application in the name of the party concerned and indicate the legal relationship between the legal representative and the party concerned. Among them, legal representatives include parents, adult children, brothers and sisters, and guardians who have no capacity for civil conduct or have limited capacity for conduct. At the same time, it should be noted that if the person involved in the accident has died when applying for re-identification, the legal representative can apply in his own name.

Legal basis: "Regulations on Procedures for Handling Road Traffic Accidents" Article 25 If the parties *** agree to request mediation, the traffic police shall conduct mediation on the spot and record the mediation results in the road traffic accident determination letter , signed by the parties and served to the parties.