Transportation Statistics and Microsimulation

292    ◾    Transportation Statistics and Microsimulation

this case the model would identify endogenously the number of vehicles of

each type traveling from each origin to each destination.

It should be noted that some packages do not input an OD matrix

directly. Instead, demand is modeled as consisting of (1) volumes enter-

ing the links and (2) turning movement percentages at intersections. is

approach has an advantage, because the volume and turning movement

information is easier to obtain in the eld than from an OD matrix. While

both methods can be used to represent demand, the former allows the

modeler more control. For example, consi ...