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在高速公路上,车速很快,如果长时间直线行车,前进方向一目了然,这样会使驾驶员缺乏感官刺激,引起思想大意和精神疲劳,以至昏昏欲睡,增加了车祸发生的机会。 另外,从视觉特性来看,人的眼睛如果长时间观察极远的地方,会使眼睛产生视差,即把近距离的物体看得十分远,从而引起目测距离的错误,这在医学上称为“空虚近视”,因此,高速公路的设计从交通安全规律及人体工程学出发,对公路直线的最大长度作了规定,一般这个长度(米)为车辆设计时速(以公里计)的20～40倍。
On the expressway, the speed is very fast. If you are driving in a straight line for a long time, the heading will be clear at a glance. This will result in the driver lacking in sensory stimulation, causing ideological and mental fatigue and even drowsiness, increasing the chance of a car accident. In addition, from the visual point of view, the human eye for a long time to observe the faraway places, the eyes will produce parallax, that is, the object is very close to see the distance, causing the error of the visual distance, which is medically called “Empty myopia,” therefore, the design of the highway from the traffic safety law and ergonomics, the maximum length of the highway has made the provisions of the general length (m) for the vehicle design speed (km) 20 ~ 40 Times