河南省许昌至南阳公路是在1955年下半年由土路改建为碎石和砾石级配路面的。建成后,由于当地缺乏养护用的砂子,所以磨耗层很快就磨坏了,面层碎石也开始松动,个别严重地段飞石满路,形成蜂窝状态,坑槽深度达2～4公分。加以当时又缺乏养护级配路面的经验和知识,一直到1956年年底始终是采取扫浆撒砂或简 Xuchang in Henan Province to Nanyang Road in the second half of 1955 by the dirt road converted into gravel and gravel grading pavement. After the completion of the construction, due to the lack of conservation sand in the area, the wearing layer soon worn out, the surface gravel began to loosen, and some serious sections of flying stones filled the road to form a honeycomb with a depth of 2 to 4 cm. In the meantime, there was a lack of experience and knowledge on the maintenance of graded roads until the end of 1956,