Abstract the traffic accident deduces the social goods and welfare directly by realizing the risk of transportation which is uneffective action of social and states in economics.

• 道路交通事故，从经济学的角度讲，是以交通运输作业所具有的外部性（对周围环境产生的危险性）在物理意义上的变现，导致直接结果是社会财货和福利的减少。