1997年冬天，一场大雪覆盖了围场大地，路面光滑如镜，给机动车的行驶带来极大不便。围场镇尹某驾驶着新买的北京牌农用车，夜间10点钟悄悄上了路。车无牌、路滑，再加上拍查车的心理压力，内外的不利因素，无疑更增加了行车的困难。但尹某自恃原来开大货车，技术高、有经验， In the winter of 1997, a heavy snow covered the yard and the road surface was smooth and mirror-like, which brought great inconvenience to the driving of the motor vehicle. Yinmou town driving a newly bought Beijing brand agricultural vehicles, quietly on the road at 10 o’clock at night. Car without a license, slippery road, together with the psychological pressure of car investigation, internal and external unfavorable factors, no doubt increased the driving difficulties. But Yinmou rely on the original open big truck, high technology, experienced,