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Which this actually isn't a straight example of, exactly. Jevon's paradox says more and better roads will mean more cars operating, not less. That happens, but in this case the increase is so great, that it leads to the same level of congestion on the roads all over again.
The wiki uses the example of coal. Better boilers and engines increased the use of coal, but it's fair to say industrial Europe had better coal powered equipment afterwards, not the same or worse. (Although, to be fair, congestion is only one metric of traffic performance)
I agree, Jevon's is not the perfect way to describe this affect. Is there a better way to classify this? It's bugged me for a bit as I've had good debates about adding biking lanes and better sidewalks instead of just more lanes for cars. But Jevon's is the best I could come up with.
No, it's relevant enough, thanks for bringing it up.
You could say something about the elasticity of road usage being 1, but if you're not a wonk that means nothing. Induced traffic is another technical term you might see around. Saying "research suggests another lane means an equal number of additional cars, eventually" is about what gets the best comprehension.