Lead by PISC Senior Scholar Erick Guerra, this paper examines the relationship between urban form, transportation supply, and individuals' mode choice across Mexico's 100 largest urban areas. It found that across urban areas, commuters are less likely to drive in dense urban areas where there are spatially concentrated jobs near population centers. Commuters are also less likely to drive in areas with better public transit supply and less roadway. Population density plays a particularly strongly role with an estimated elasticity four times as strong as recent studies from US urban areas. Taken together, the findings suggest a strong correlation between land use planning and commute patterns, a connection that policies can utilize to decrease traffic.