汽车作为高度的机动化的动力装置,在给人们的生活带来快捷和方便的同时,也引发了很多问题。最突出的问题就是因交通事故带来的巨大的人员伤亡和财产损失。从19世纪以来,全世界每年因交通事故死亡的人数大概是50万人左右,受伤的人数是1000万人。所以交通事故带来的巨大的人员伤亡和财产损失是非常惊人的。正像美国一 As a highly motorized power unit, the car has brought many problems to people’s life at the same time as it is fast and convenient. The most prominent issue is the huge casualties and property losses caused by traffic accidents. Since the 19th century, the number of people killed each year in the world due to traffic accidents has been around 500,000 and the number of wounded people has reached 10 million. So the huge casualties and property damage caused by traffic accidents are very alarming. Just like the United States