木材及其制品的公路运输是整个木材生产成本的一个重要部分。运材车吨公里的运输成本与运输的净载重量成反比。因此,通常在法定范围内尽可能提高载量,以降低运输成本。各州根据一些类型的车轴载荷限额限制最大净载,以保护桥梁和公路。最近,州的法规已经趋向用增大车辆的容许长度,容 Road transport of wood and its products is an important part of the overall timber production cost. The transport cost per tonne of freight car is inversely proportional to the net weight of the carriage. Therefore, it is common to maximize the load within the statutory limits to reduce shipping costs. Each state limits the maximum net load based on some types of axle load limits to protect bridges and highways. Recently, state regulations have tended to increase the allowable length of vehicles