I don't buy that it's not a useful concept. Space is limited in geographic areas so it seems like a zero-sum game to me. Adding more lanes means there is more s

I don't buy that it's not a useful concept. Space is limited in geographic areas so it seems like a zero-sum game to me. Adding more lanes means there is more space to be utilized by cars, taking away space to be used for other productive means of transportation. The demand to travel is still there, as the author asserts, but it's how we use the space we have to provide it that matters. If you add another lane you induce demand for more cars since there is less useful land to build on for other purposes and you make it harder to get around by other means.