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在山的中坡(腰部),延着山的两侧修建的盘山林道叫做中林道,俗称腰路。严格地说,中林道是根据合理路网密度而布设在山坡上的间隔线。祖邻两条林道之间的平均距离称林道间隔。布设中林道可使高山林区的路网密度达到合理的程度,可缩短集材距离,解决顺沟展线中纵坡大,回头多,工程大,测设复杂的难题。同时可克服砍低留高,山头带帽,下重上轻,集中过伐等不合理的作业现象。
In the mountain slope (waist), extending along both sides of the mountain plateau forest called Zhonglin Road, commonly known as the waist. Strictly speaking, Zhonglin Road is a dividing line laid on the hillside according to a reasonable road network density. The average distance between two adjacent forest roads is called the forest road interval. The layout of forest road can make the density of road network in mountainous area reach a reasonable level, which can shorten the distance of skateboard, and solve the problem of large longitudinal slope, large turnaround, large project and complicated survey in Shunchao Line. At the same time, it can overcome the unreasonable operating phenomena such as cutting down and keeping high, with a cap on the hill, under the light and on the overcrowded.