American parking requirements: Massive (mostly), arbitrary, and costly

The large supply of parking has become a key concern in transportation and land use planning. Lots of parking makes it difficult for non-motorized modes to function, shifts costs from drivers to others, encourages SOV use, reduces available land for higher and better uses, creates stormwater issues, and so forth. One factor driving the prevalence of parking is regulation through zoning codes that impose parking minimums.