Whether a traffic accident will be detained depends on the situation. There is no need to detain except after drinking and in the following cases.
 According to the Interpretation of the Supreme People's Court on Several Issues Concerning the Specific Application of Law in the Trial of Criminal Cases Caused by Traffic Accidents, if a traffic accident falls under one of the following circumstances, it shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention: (1) one person died or more than three people were seriously injured, and bear all or the main responsibility for the accident; （2） More than three people died, and they are equally responsible for the accident; （3） Causing direct losses to public property or other people's property, bearing all or the main responsibility for the accident, and being unable to make compensation of more than 300000 yuan.