意外事故使交通阻塞了半小时。
事故使公路交通阻塞了一个多小时。
The accident tied up all traffic along the highway for more than an hour.
往往城市交通阻塞大都发生在交叉口，不仅导致了车流中断、事故增加、延误加重，还导致城市环境污染加剧。
Urban traffic congestion most often occurred in the intersection, which not only led to traffic disruption, accidents increased and delays aggravation, also led to urban pollution increased.
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