Click on Add to create a similar entry for HBO, and again for NHB. Select the "Friction Factors" tab. Highlight the HBW purpose. Under "Factors Come From," select Matrix. Under "Friction Factor Matrix," enter:
- Matrix File: Friction Factor Shell
- Matrix: HBWFF
Highlight the HBO purpose. Under "Factors Come From," select Matrix. Under "Friction Factor Matrix," enter:
- Matrix File: Friction Factor Shell
- Matrix: HBOFF
Highlight the NHB purpose. Under "Factors Come From," select Matrix. Under "Friction Factor Matrix," enter:
- Matrix File: Friction Factor Shell
- Matrix: NHBFF
- Click OK and save output matrix as p-a.mtx. Under "Label," enter P-A.
TransCAD generates P-A flow matrices that match the productions and/or attraction vectors based on the friction factor matrix. transcad evaluates the 3 models, displays a Summary dialog box (with access to a Notepad file) stating that all three models converged, and displays a matrix view (P-A) containing the results.
4.3 Converting P-A to O-D and Time-of-Day Transformations
The trip table produced in Task 4.2 contains Production-Attraction distribution matrices for three trip purposes (see p-a.mtx file). These matrices represent total 24-hour person trips and must be converted to Origin-Destination vehicle trips for a defined analysis period (such as the PM-peak hour) prior to traffic assignment.
4.3.1 Conversion from P/A Format to O/D Format
All demand analysis has thus far been expressed in terms of productions and attractions. Prior to route assignm
