traffic属于物质名词，是不可数名词，均用单数形式。一般是单数，需要用复数的时候只有jam变形，复数：traffic jams堵车，交通阻塞。traffic jams的近义词：heavy traffic例：I hope there will be fewer traffic jams and less pollution in the future.

例句：

There is a traffic jam.

交通阻塞。

The traffic jam interrupted the flow of the cars.

交通阻塞中断了小车的行驶。

There was a traffic jam because two cars were tailgating.

交通堵塞是因为两车追尾。

Oh,there's a traffic jam.

哦，堵车了。

There's another traffic jam on the highway.

公路上又堵车了。

I'm terribly sorry for being late.I was caught in a traffic jam.

很对不起我迟到了，我在路上遇到了塞车。

I was stuck in a traffic jam.

我被困在了交通堵塞的情况中。

We were delayed by a traffic jam on the highway this morning.

今天早上我们给公路上交通阻塞耽搁了。

I was stuck in a traffic jam for an hour yesterday.

昨天我堵车堵了一个小时。

When I went home,I was caught in a traffic jam.

当我回家的时候，我碰上了交通堵塞。

I was caught in a traffic jam.

我碰到了交通堵塞。

But I can't reach there on time due to a traffic jam.

但是由于交通阻塞我不能按时到那儿了。

We were caught in a traffic jam this morning.

今天早晨堵车了。

Sorry I'm late& I got stuck in a traffic jam for half an hour.

对不起我迟到了&我被交通堵塞堵了半个小时。

The traffic jam is breaking up,so we can drive on.

堵车开始疏通了，我们又可以继续开车了。

I was on the highway yesterday in a terrible traffic jam.

我昨天咋高速公路上出了起严重的交通堵塞。