trafficking

heavy/rush-hour traffic

繁忙的╱高峰时刻的交通

local/through traffic

当地╱过境车辆

There's always a lot of traffic at this time of day.

每天这个时候总是有很多来往车辆。

They were stuck in traffic and missed their flight.

他们遇到了塞车，没赶上班机。

a plan to reduce traffic congestion

减少交通拥塞的计划

traffic police(= who control traffic on a road or stop drivers who are breaking the law)

交通警察

The delay is due simply to the volume of traffic .

延误完全是因为交通拥挤。