This map by Dr. Steven Fleming of Cyclespace looks at space for bicycles in Detroit with a dense and bikeable future:

Did you know that a 9.3 mile (15 kilometer) diameter city, if it were as dense as Manhattan, would have a population of 6 million people? And did you know that if it were designed around cycling – the way, say, Houston was designed around driving, or how Venice was designed around boats – and if no vehicle were allowed in that city that impeded the smooth flow of bikes, that the average commute time would be faster than in any other city that size? This was one finding from a design research project I ran. I’m now in the process of disseminating these and other findings to my colleagues and bike transportation enthusiasts.

Related: Land Use for Automobiles 1974