Tunnel engineering becomes more and more used to pass through the mountains and enhance the road grade.

隧道工程越来越多地用于穿越山岭,提高道路等级。

As China's economic developing,the requirements of road grade are higher and higher,a large number of road tunnels have emerged as.

随着我国经济的发展,对公路等级的要求也越来越高,大量的公路隧道也随着出现。

And that will reduce the transport cost of the logistics of our country. This paper qualitative analysis the road grade’s influence on transporting cost, and analysis the Urban Road System overall arrangement’s influence on transport cost.

这也将促进我国物流运输成本的降低,论文正是在分析道路等级和城市道路网络布局的基础上,定量研究道路等级对运输成本的影响和定性分析城市路网布局对运输成本的影响。