1) Characteristics of the accident object.

2) Right of way.

3) Whether there is any violation. For example, speeding, not driving in the prescribed lane, etc.

In addition, it depends on whether there are other violations, such as drinking.

Legal basis: Road Traffic Safety Law of the People's Republic of China.

Article 72 After receiving the traffic accident alarm, the traffic administrative department of the public security organ shall immediately send traffic police to the scene, first organize the rescue of the injured and take measures to restore traffic as soon as possible. The traffic police shall conduct an inquest and inspection on the scene of the traffic accident and collect evidence; Due to the need of collecting evidence, the accident vehicle may be detained, but it shall be properly kept for verification. The traffic administrative department of the public security organ shall entrust a specialized agency to conduct a professional inspection of the physical and mental condition of the parties. The appraisal conclusion shall be signed by the appraiser.

Article 73 The traffic administrative department of the public security organ shall, according to the on-site inspection, inspection and investigation of traffic accidents and the conclusions of relevant inspection and appraisal, make a traffic accident identification in time as evidence for handling traffic accidents. The traffic accident certificate shall state the basic facts, reasons and the responsibilities of the parties, and shall be served on the parties.

Seventy-fourth traffic accident compensation disputes, the parties may request the traffic administrative department of the public security organ for mediation, or directly bring a civil lawsuit to the people's court.

After mediation by the traffic administrative department of the public security organ, if the parties fail to reach an agreement or fail to perform the mediation after it takes effect, the parties may bring a civil lawsuit to the people's court.