" But the traditional model of urban expansion followed by new roads has created a vicious spiral where new roads beget more cars, which beget the need for more roads."
#2 Did one encounter any traffic?
Never-mind that all of us compose traffic, and that the proper terminology would be 'delays' or 'congestion'.
Just imagine such a philosophy adapted at any other point in time/history.
What bridges or tunnels would have not been built under such a defeatism.