The number 1 easiest way to convince carbrains to support non-car-centric transportation infrastructure (in my experience)
"Giving people more viable alternatives to driving means more people will choose not to drive, so there will be fewer cars on the road, reducing traffic for drivers."
Concise, easy to understand, and accurate. I have used it at least a dozen times and it is remarkable how well it works.
Also—
"A bus is about twice as long as a car so it only needs to have four to six passengers on board to be more efficient than two cars."
I think that actual, legitimate carbrains (me, self-defined driving enthusiast) are such a small demographic that their opinion doesn't matter.
I think there are many, many more people that don't give a shit about driving but do it out of necessity.
"Carbrain" refers to a person who believes that driving and personal transportation as synonymous and thinks accordingly when deciding to support or oppose transportation infrastructure and urban planning projects.