What should the driver do—whether fasting or not—if a traffic accident results in the death of two people, and the legal fault lies with the other party?

If an accident occurs without any negligence on your part, such as driving at the speed limit and taking the necessary precautions for car maintenance, and it is proven that the other party was at fault, then you are not liable for any compensation or expiation. One must refer to the competent authorities to investigate the circumstances of the accident and question both parties.