This report is an oldie (2015), but a goodie.
However, it is parking, not density, that creates traffic congestion. Excessive parking supply that is cheap or free induces people to use personal motor vehicles—even when good public transport is provided.
Cities across the world are now realizing their past follies. They now follow a simple mantra— add transit, build density, cut parking. Put another way, where there is good connectivity to mass rapid transit, building density is welcome but parking supply is not.
I know I’m guilty of taking my car on short trips when I can predict that parking will be bountiful (Hello, Summers in Austin, when student counts are low and temps are high!)
But I would certainly more readily take transit if parking were limited, and especially so if our Texas-sized parking lots instead made room for more storefronts and walkable spaces in close proximity.