Here's a way it was explained to me by someone who designs roads;
Think of the highway as a pipe.
Think of the cars as the water.
When the amount of "water" is equal to or less than then the capacity the "pipe" was designed for, the flow will be smooth.
When the amount of "water" is greater than the capacity of the "pipe", the flow will be slow and can even stop.
As a water molecule, when you try to break through this back up, you create turbulence.
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