So, it "is always a bit of," meaning a little bit — somewhat of a problem at this hour. 因此，“在这个点时总会有点麻烦”。

"Traffic is stop-and-go all the way from downtown."  “离开市区的路上交通非常缓慢”。

We use that word traffic, "traffic," to mean the cars on the street or the cars on the freeway.  我们使用交通（traffic）这个词，来指街道上或高速公路上的车辆。

You may ask someone, "How was traffic," and they may say, "Oh, it was terrible.  你可能会询问某人，“交通怎么样啊”，然后他们可能会说，“哦，糟透了，

Traffic was really bad on the freeway this afternoon."  今天下午高速公路上的交通非常糟糕”。

So, it refers to the number of cars and how easy it is to move on the freeway or the street.  因此，这个词提到了车子的数量以及在高速公路或街道上行驶的容易程度。

When we say traffic is stop-and-go we mean that cars are stopping then they go forward maybe ten feet, 20 feet, then they stop again.  当我们说“traffic is stop-and-go”的时候，我们是指车子停了下来，接着向前行驶了十至二十英尺，然后又停了下来。

When there are too many cars on the freeway or on a road, you cannot just drive straight through, you have to stop, 高速公路或马路上的车子太多的时候，你就无法一直往前开，你必须停车，

wait for the other car and then go, so stop-and-go traffic means that the traffic is moving very slowly. 等前面的车子开走后，你再往前开，因此，“stop-and-go traffic”就意味着交通非常缓慢。