1. Application of Three Types of Multi- Point Assignments Yanping Zhang Durham-Chapel Hill-Carrboro MPO/City of Durham Soon Chung North Carolina DOT Gnani Mahalingam City of Kansas City, MO Mohsin Zaidi Virginia DOT 1 14 th TRB Transportation Planning Application Conf. - May 2013

2. Standard User Equilibrium (UE) Assignment 2 Zone Centroid - Origin Zone Centroid - Destination Centroid Connector Access Point 14 th TRB Transportation Planning Application Conf. - May 2013 East Ave 6 th St 7 th St West Ave 600 200 33.3% 600 33.3% 400 33.3% 200 Finding shortest time paths between centroids Weak control on trip local loading directions

3. UE Multi-Point Assignment (MPA) Type 1 - Fixed Loading Rate 3 Zone Centroid - Origin Zone Centroid - Destination Centroid Connector Access Point 14 th TRB Transportation Planning Application Conf. - May 2013 6 th St 7 th St East Ave West Ave 25% 10% 40% 60 600 240 300 Finding shortest time paths between access points Strong control on trip local loading directions

4. Type 2 - Fixed/Variable Loading Rates by Centroid Connector 40% O-D Trips Loaded onto West Ave 60% O-D Trips follow UE assignment to other 3 directions, i.e. r1+r2+r3=60% 4 6 th St 7 th St East Ave West Ave r1 r2 r3 40% 50% 14 th TRB Transportation Planning Application Conf. - May 2013

5. Type 3 – Fixed/Variable Loading Rates by Group of Trips 60% trips follows the fixed rates 40% trips follows the UE assignment rule, r1+r1+r3+r4=40% 5 6 th St 7 th St East Ave West Ave 6% + r1 15%+ r2 15% + r4 24% + r3 50% 14 th TRB Transportation Planning Application Conf. - May 2013

6. Summary of Three MPA Types Type 1 - Fixed Rate Loading Strategy, Robert Shull 1999 (implemented in TModel2) Limitations of Fixed Loading Rates. 1.Not Account for Future Land Use & Accessibility Change 2.Not Account for special cases, like Partial fixed Loading Type 2 - Fixed/Variable Rate Loading by centroid connectors – Some centroid connectors got fixed loading rates – Other centroid connectors got the variable rates determined by UE assignment Type 3 – Fix/Variable Rate Loading by Trip Groups – One Group of trips follows the fixed rate strategy – Another group of trips follows the UE assignment 6 14 th TRB Transportation Planning Application Conf. - May 2013

7. MPA Tool Multi-Class MPA tool, coded in GISDK for use in TransCAD MPA (Type) Field in node layer and it can handle MPA value=1, 2, 3 in one model In/Out rate fields in link layer 7 14 th TRB Transportation Planning Application Conf. - May 2013

8. Subarea MPA Application 2005 PM Peak Hour - North Land Subarea, Kansas City. The airport & north shopping mall are located in the subarea MPA Result Non-MPA Result 8 14 th TRB Transportation Planning Application Conf. - May 2013

9. Type 2 - Zone with Off-Site Loading 9 14 th TRB Transportation Planning Application Conf. - May 2013 Triangle Regional Model (TRM) V4, 2005 PM Peak Assignment

10. Types 1 and 3 – Special Zone-RDU Airport 10 14 th TRB Transportation Planning Application Conf. - May 2013 Triangle Regional Model (TRM) V4, 2005 PM Peak Assignment

11. Conclusions 1.MPA improves local traffic loading for large special zones, such as airport, university campus, and shopping mall 2. MPA improves traffic loading for off-zone (site) parking lot/garage 3. MPA improves the assignment result for the small area studies and/or the corridor study. 11 14 th TRB Transportation Planning Application Conf. - May 2013