它们大大减少了路上的车流量。
车流通畅，相互紧随行驶的车辆能利用前车产生的较小的空气阻力，这些都可能减少油耗和污染。
Fuel consumption and pollution might be reduced by smoothing traffic flow and running vehicles close enough to each other to benefit from aerodynamic drafting.
合理的道路横断面型式一方面可以保证车流的畅通，另一方面也可以通过合理的绿化布置减少交通对环境的污染。
Reasonable type of road cross section could ensure the smooth vehicle flow, at the same time, it could reduce the pollution of traffic to environment through reasonable greening arrangement.
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