1. An intelligent traffic safety decision method based on comprehensive state detection, wherein before making an action decision, an avoidance requirement of a crash with a front single-target barrier is considered first; if no intervention is applied, a crash occurs after the time expressed as follows: t relative = r relative v relative an influence of a person condition is further considered; the most basic requirement for avoiding a crash is to satisfy the following non-intervention crash incurrence time constraint criterion: 
 t relative >t dr an influence of a vehicle condition is further considered; the most basic requirement for avoiding a crash is to satisfy the following intervention acceleration constraint criterion: a relative = v relative t relative = v relative 2 r relative < a brake an influence of a road condition is further considered; the most basic requirement for avoiding a crash is to satisfy the following constraint criterion: v relative 2 r relative < k gradient k crooked a brake Where, r relative is a relative distance reference value, v relative is a relative speed reference value, k gradient is a gradient influencing coefficient, and k crooked is a camber influencing coefficient.