今天早上高速公路上发生了严重的交通堵塞。

There was a bad ___traffic ___jam on the highway this morning.

高峰时段经常导致市中心交通堵塞。

Rush hour often causes ___traffic ___jams in the city center.

由于交通堵塞，我的公交车晚点了。

My bus was late due to a ___traffic ___jam.