What is the meaning of idiom traffic

The idiom "traffic" doesn't have a specific meaning on its own. It's likely you're thinking of a phrase that includes "traffic" like:

* Heavy traffic: This means there are many vehicles on the road, making it difficult to move quickly.

* Traffic jam: This refers to a large number of vehicles stuck in a line and unable to move.

* Traffic flow: This describes the movement of vehicles on a road.

* Traffic light: This refers to the signal that controls the movement of vehicles at an intersection.

Could you please provide more context about how you encountered the word "traffic"? That would help me understand which phrase you're referring to and give you a more accurate answer.