But look at this interesting new addition to the talk page!
To me, and I guess to anyone who has ever talked about the problem with roads with anyone, it seems totally self evident that "widening roads eases congestion" is an extremely common misconception! But Wikipedia needs sources, and I really respect them for that.
I'm sure someone here can help with that. A link to some sort of study on people's attitudes towards widening roads, for example? @notjustbikes, or someone in #Urbanism?