Trip Generation

In this Workflow step, you will enter the Trip Generation data for each development Zone in the network in a tabular setup. The data entry is all user-defined with calculations completed based on your entries.

In the upper right corner of the workflow, the position of the Trip Generation table can be switched to the horizontal or vertical position using the Switch Table Position for a better view of the table.

Data entry is similar to other data tables in the Workflow Panel, using text and numerical entries, drop-down lists, and checkboxes, as shown in the figure below. Each of the trip generation entries are described in the table Trip Generation Parameters below:

Figure 20: Trip Generation Table

Table 25: Trip Generation Parameters

Parameter	Description	Details
No	Zone number
Name	Zone name	Project name
Land Use variables	Description of land use type	Examples include single family residential, office, retail, etc.
Land Use Code	Code number for referencing land use type	Example would be use of ITE land use code from Trip Generation Manual
Data Entry	Rate or Trips. When using the ITE Trip Gen App API, Rate yields trips from the Rate method, and Trips yields trips from the Fitted Curve Method.	Users can enter either a trip generation rate or directly enter the number of trips (see section ITE Trip Gen App API)
Independent Variable	Variable that is the basis of the trip generation rate	Examples include dwelling units, thousand square-feet of leasable area, occupied hotel rooms, students, etc.
Trip Generation Rate	Trip generation rate per independent variable, for the time period of analysis
Quantity	Quantity of the Independent Variable
% In	Percentage of trips that are inbound to the Zone
% Out	Percentage of trips that are outbound from the Zone
Trips Generated	Number of trips generated	Product of Independent Variable x Trip Generation Rate x Quantity
Trips In	Number of trips generated inbound to the Zone	Product of Trips Generated x % In if Data Entry = Rate, or user entered value if Data Entry = Trips
Trips Out	Number of trips generated outbound from the Zone	Product of Trips Generated x % Out if Data Entry = Rate, or user entered value if Data Entry = Trips
% Internal Capture	Factor to reduce and adjust trips, e.g. to define a public transport utilization factor	Affects the Trips In, Trips Out, and Trips Generated values
Trips Generated Adjusted	Number of trips generated in consideration of the % Internal Capture value	If Data Entry = Rate Trips: Trips Generated Adjusted := round(x * Trips Generated) If Data Entry = Trips: Trips Generated Adjusted := round(x * (Trips In Adjusted + Trips Out Adjusted))
Trips In Adjusted	Number of trips generated inbound to the Zone in consideration of the % Internal Capture value	Trips In Adjusted := round(x * Trips In)
Trips Out Adjusted	Number of trips generated outbound to the Zone in consideration of the % Internal Capture value	Trips Out Adjusted := round(x * Trips Out)
Trip Type	Trip added to or removed from the network	Added should be selected for all new trips to the network (i.e., from new development projects). Removed should be selected for trips to be removed from the network (i.e., to represent existing trips from a land use that will be removed).
Analyze	Checkbox to select if Zone should be analyzed or not in current scenario	When checked, trips from the Zone will be generated for the current scenario.
Comment	Comment field for user text entry
ITE TripGen	Opens PTV Vistro’s ITE Trip Gen API dialog	After log in, this link opens PTV Vistro’s ITE Trip Gen API dialog to interface with the ITE Trip Gen App data (see section ITE Trip Gen App API). This can also be accessed with a right-click of the context menu on each data row.

The trip generation data are applied, along with the trip distribution data entered in the Trip Distribution Workflow Task Table (see section Trip Distribution) and the Path percentages entered in Trip Assignment Workflow Task Table (see section Trip Assignment), to determine the traffic assignments on the network.