Thoughts during commute

When driving to work I often think that ther must be a physical process that models the similar situation to one of cars moving along a highway. I discarded the idea that this can be described as an electric current, even though an idea of having a fricktionless motion as in superconductivity is appealing. Reason being, I doubt that there could be waves of density in electric current.

But as a flow of a supercooled liquid or gas, this can very much be it. These models can in fact match so well, that physicists could abandon their expensive equipment and just film the traffic. Here's a stream moving steadily... Here highway expands and the distance between molecules increases. Look, here an injection of cooler, slower molecules into the stream sends waves of compression for miles back of this junction. Is it a useless idea?