货车流量存在与否、货车流量的大小、货车运行的性质（如，高架道口或平交道口）。
The presence or absence of freight traffic, the volume of freight traffic, and the nature of freight operations (e.g., overhead vs. local switching).
鲍勃：安全第一是最好的宗旨。看那辆货车，拐进朝他开来的车流中去了。
Bob: Safety first is the best policy. Look at that pick up truck, he is turning into oncoming traffic.
尽管在诸如伦敦这样的国际大都市内驾驶的人数正在缩水，但是由于网络购物的增长以及人口的增加，仍然有更多的送货车以及汽车加入到拥挤的车流当中。
Although the number of people driving in cosmopolitan areas such as London is shrinking, the rise of online shopping and a growing population are pushing more delivery vans and cars on to busy roads.
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