Table 4 contains two sections, “Outcome Variables” and “Explanatory Variables.” The second section, “Explanatory Variables,” is often associated with the “D” variables that affect trip generation. These include development density, diversity, design, destination accessibility, distance from transit, development scale, and demographics. The output of the hierarchical modeling involved in the MXD model’s research and development included the individual and combined effects of the seven types of “D” variables on the travel characteristics of 239 targeted mixed-use development areas. Via this research, the variables above were determined significant.