traffic 做宾语时加名词。
She is stucked in a traffic jam. 她被困在堵塞的交通里
There has been a decrease in traffic accidents. 交通事故减少了。
traffic 做主语 后面是谓语要用动词。
Air traffic had returned to normal。 空中交通已恢复正常。
Traffic was unusually light for that time of day. 对于一天中的那个时间段而言,来往车辆少得有些不寻常
traffic jams/problems