If the party refuses to sign for it, it may be served by mail within seven days, and it shall be deemed to have been served on the party concerned. The traffic accident certificate refers to the technical conclusion made by the public security traffic management department after analyzing the basic facts, reasons and responsibilities of the parties through on-site investigation, technical analysis and relevant inspection and appraisal conclusions of traffic accidents. The traffic accident responsibility confirmation issued by the traffic police is still valid if one party does not sign it. According to the law, mediation is not applicable if the parties refuse to sign the road traffic accident certificate.

I. Causes of traffic accidents:

1, the road grade is low.

2. The overall composition of the vehicle is unreasonable.

3, part of the passenger transport enterprise safety production system is not implemented.

4. The driver's safety awareness is weak.

5. Traffic management measures are not in place.

Second, what should be compensated for the full responsibility of traffic accidents:

1, the maintenance fee of the other vehicle;

2, involving casualties, should compensate for the loss of medical expenses and income;

3, disability compensation, disability AIDS;

4, funeral expenses, death compensation, etc.

Legal basis: Provisions on Procedures for Handling Road Traffic Accidents Article 60 The traffic administrative department of the public security organ shall determine the responsibility of the parties according to the role played by their actions in road traffic accidents and the severity of their faults.

(a) due to the fault of one party caused by road traffic accidents, take full responsibility;

(2) If a road traffic accident occurs due to the fault of two or more parties, they shall bear primary responsibility, equal responsibility and secondary responsibility respectively according to the role their actions played in the accident and the severity of the fault;

(3) The parties are not at fault for causing road traffic accidents. If it is a traffic accident, neither party is responsible.

If one party intentionally causes a road traffic accident, the other party shall not bear the responsibility.