An algorithm for solving the "Sanqi" responsibility in traffic accidents: 1. If a motor vehicle purchases compulsory insurance, the insurer who underwrites the compulsory insurance for motor vehicles shall pay compensation in advance within the limit of compulsory insurance liability; 30% of the insufficient part shall be borne by those who bear the secondary responsibility, and 70% shall be borne by those who bear the primary responsibility. 2. If the motor vehicle fails to purchase compulsory insurance, all the losses caused to the infringed shall be determined according to the person who bears the secondary responsibility for 30% and the person who bears the primary responsibility for 70%. According to Article 1208 of the Civil Code of People's Republic of China (PRC), if a motor vehicle is damaged by a traffic accident, it shall be liable for compensation in accordance with the Road Traffic Safety Law and the relevant provisions of this law. Article 123 If the damage caused by a motor vehicle accident is the responsibility of one party of the motor vehicle, the insurer who underwrites compulsory motor vehicle insurance shall make compensation in advance within the limit of compulsory insurance liability; The insufficient part shall be compensated by the insurer underwriting motor vehicle commercial insurance in accordance with the insurance contract; If the motor vehicle commercial insurance is still insufficient or uninsured, the infringer shall compensate.