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 Source: Author calculations.
 USC codes were developed at the University of Southern California to establish a common industry code system compatible with SIC, SCTG, and IMPLAN industry codes (Park et al, 2007).
 We were unable to replicate our previous O-D matrix results by running Argos planner on the original data, despite completely checking all data inputs and all computations within Argos. Thus our verification of TransCAD results is based on using the same O-D matrix as in the previous work.
 The SCAG screenlines are dated 2003 even though the data are drawn from 2001 counts.