What is the difference between 拥堵 and 堵车? I found the following sentence:


  这次降雪给交通带来了严重影响，一些高速公路封闭，一些地段出现拥堵。


However, another word I already knew is 堵车, which I have seen more times.

So now I wonder whether there is any difference between these two words, and if there is, what is it?
The main difference between 堵车 and 拥堵 is that 堵车 is usually used as a verb, while 拥堵 is usually used as a noun.  For example,  前面堵车了 and 前面交通出现了拥堵; 防范交通拥堵, not 防范交通堵车;