#TIL 高速上那种黄黑相间的护栏开始部分的标识（Impact head）其实是可以帮助减小碰撞冲击力的装置，撞上去会把后面的钢铁护栏弯折形变的。甚至水泥护栏头也有一段是吸收 impact 的。
我之前一直以为撞上这个东西就死神来了呢……基建工程师们为了我们在路上能活着真是煞费苦心啊！
图来自于 Engineering in Plain Sight 这本书，看了之后会更加 appreciate 一些日常 take for granted 习以为常的基础设置。我本来在图书馆借的，觉得还挺不错的到期了之后没看完就自己买了一本。
#reading #安利避雷
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