It is statistic that over 50% in traffic accident caused in thruway are result from drowsiness and absence, even nap because of longtime driving.

• 有资料表明，高速公路发生的交通事故中，有50%25以上由于长时间疲劳驾驶或所见目标单调使司机注意力不集中、甚至打瞌睡等原因造成的。