Minneapolis has a surprisingly simple plan to cut traffic and make housing more affordable
http://www.vox.com/2015/7/15/8970119/parking-affordable-housing
For a long time in Minneapolis, almost everyone who wanted to build a new apartment complex was required to add one parking spot for every unit in the building whether or not residents wanted one.
There was an exception for a small area downtown, but not for outlying neighborhoods served by light rail and bus systems. And all these unneeded or unwanted parking spots would add to the cost of construction, drive up rent, encourage driving, and take up valuable land as they sat empty. This sort of minimum parking requirement is the law in almost every city across the country....
Small or midsize buildings that are within walking distance (specifically, a quarter-mile) of a rail or bus line no longer have to build any off-street parking at all. Large buildings (those with 50 or more units) now only have to provide one space for every two units.
It's not perfect, but it's a huge step in the right direction and one that other cities nationwide should follow if they care about providing affordable housing or reducing traffic.
Here in California, TransForm has been pushing this for years.
http://www.transformca.org