A new regional survey released in the US has found that the states of Illinois, Indiana, Michigan and Wisconsin combined have 1,260 square kilometers of paved parking lots, or 5% of urban land use. That’s about 2.5 parking spaces per car, not even counting street parking, private car parks, and parking structures. If you add all of this together, you get about 3 to 3.5 spaces per car and a higher percentage of urban land use.
This would seem to indicate that better planning and intelligence about car parking requirements is required in order to reduce wastage of in-demand urban land and, hopefully over time, this will see cities that are better to live in.