Has anyone done any research to determine which residential densities around transit stations have the greatest effect on reducing car trips?
We know that a certain minimum density is required to make transit work, but I wonder about TOD plans that put highrises all around the stations. The small households that live in highrises don't generate a lot of car trips wherever they live. By clustering them around transit, we are increasing the average distance between the larger households and transit, and it is these larger households that have the cars and that use them.
I'm not a real estate expert, but families with children, even those for whom access to transit is a priority in choosing their home, aren't likely to want to live next to a cluster of highrise apartment buildings.
Any hard data on how high densities affect modal split, or on how moving closer to transit affects transit use in households of different sizes?