^Not that that vision was ever meant to be taken seriously, I think you'd really have to stretch things to call it realistic.
This is the modern outcome of St. Louis' Olive Street.
![](http://static.panoramio.com/photos/original/1730202.jpg)
Source:
http://www.panoramio.com/photo/1730202
No airships (nor weird airship-docking tower in the background), no trams, no packed sidewalks, no carless culture, no solid walls of 40+ story brick-clad buildings. No monumental lions.