It should be noted, however, that, trip distribution procedures can be utilized to estimate O-D tables for different trip
purposes. Alternatively, the synthetic O-D approach cannot segregate trips by purpose unless the link counts are also
classified by trip purpose. However, a possible approach to estimating purpose-specific O-D tables would be to utilize trip
distribution procedures to derive O-D tables for the different trip purposes (where Tijk is the estimated number of trips
between zones “i” and “j” for purpose “k” using trip distribution procedures). Scaling factors (cijk) for each O-D pair can be
computed using Equation 3. These O-D demand specific scaling factors can then be multiplied to the synthetic O-D table
to generate purpose-specific O-D tables that are consistent with observed link flows.