对于一些线路，交通量可能会很低以至于不用路面在经济上都是合理的，天然的土壤就可以直接为道路服务。
For some routes, traffic volume may be so low that no surfacing is economically justified and natural soil serves as the roadway.
当交通量增多和出现拥堵时，高密度的单行线路网系统(模式4)更具优势。关键结论可直接指导规划实践。
When the traffic volume increases and leads to light congestion, the high density and one-way street network system (Mode 4) is the best. Key conclusions can directly guide road network planning.
当交通量增多和出现拥堵时，高密度的单行线路网系统(模式4)更具优势。关键结论可直接指导规划实践。
When the traffic volume increases and leads to light congestion, the high density and one-way street network system (Mode 4) is the best. Key conclusions can directly guide road network planning.
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