Here’s a fun chart [actually a graph] from the VTPI (via Planetizen) that combines speed with the amount of land required to support the different modes, resulting in the fun unit of measure “square-meter-minutes”:
According to the author, the chart reveals that:
Since each car requires road space plus two to six parking spaces (at home, work and other destinations), a car uses more land than most urban residents’ homes. Walking, cycling and public transit require far less space.
Basically, transportation and land use are connected because of these disparate ratios. How we move has strong correlation with the kinds of spaces in which we live and work. A lot of this has to do with parking.