Jane Jacobs is an interesting case in that many of today's urbanists read in her what they want to read.

She was indeed against highways going through the middle of cities and in favor of walkability and mixed use.

At the same time, she also opposed rationalist urban planning like Le Corbusier's clusters of towering skyscrapers. She would likely not have favored the mass building of vertical housing that many of the same people who oppose cars want in order to reduce housing prices.