All of this would look remarkably modern if not for the horse drawn carriages

What struck me about this 1903 cover from Scientific American was the way planners set aside dedicated spaces for different modes of travel, one  level for pedestrians, one for cyclists, one for automobiles and carriages, and two for trains, an allotment that would no doubt please many urbanists today.

This begs the question, did this approach to urban transportation fall out of fashion? Or was it one of those things that had a way of showing up in proposals but which seldom made it to the groundbreaking?