upbound traffic

例句：

1. 1. The upbound traffic is increasing due to the construction of a new highway.
   由于修建了一条新的高速公路，上行交通量正在增加。
2. 2. The upbound traffic is expected to reach 50 million vehicles by 2030.
   预计到2030年，上行交通量将达到5亿辆。
3. 3. The upbound traffic is a major contributor to air pollution in urban areas.
   上行交通是城市地区空气污染的主要来源之一。