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Development of Mid-Ohio Regional Planning Commission Tour-Based Model Rebekah S. Anderson, Mid-Ohio Regional Planning Commission I n 2002, the Mid-Ohio Regional Planning Commission and travel, and intrahousehold allocation mechanisms (MORPC) contracted with PB Consult to develop a new for maintenance activities. regional travel forecasting model. The new model is an Enhanced temporal resolution of 1 h, with explicit activity and tour-based model applied with microsimula- tracking of available time windows for generation and tion. The development of the model was based on the 1999 scheduling of tours instead of the four or five broad time- Household Interview Survey, which was supplemented by of-day (TOD) periods applied in most of the conventional the 1993 Central Ohio Transportation Authority On- and activity-based models previously developed. The time- Board Survey and an external cordon survey conducted in of-day choice model adopted for MORPC is essentially a 1995. The new model system was completed in 2004. continuous duration model transformed into a discrete The MORPC model incorporates most of the positive choice form. The enhanced temporal resolution opens a features of the other activity- and tour-based models as way to control explicitly the person-time windows left well as the growing body of research on activity-based after scheduling of each tour and to use the residual time modeling and microsimulation. In particular, the struc- window as an important explanatory variable for genera- ture and application experience of the San Francisco tion and scheduling of the subsequent tours. County Transportation Authority model and New York Metropolitan Transportation Council model had been At the first step, the model system generates a synthe- carefully studied before the decisions about the MORPC sized list of all households and population for the entire structure was made. When compared with its predeces- area, consistent with the household and workforce vari- sors, the MORPC structure represents two significant ables in the zonal data. The output from this population steps toward a better and more realistic description of synthesis model is a file with a record for every person in travel behavior: the area (currently about 1.5 million), containing vari- ous attributes for each synthesized person. Attributes Explicit modeling of intrahousehold interactions include the household to which the person belongs; and joint travel that is of crucial importance for realistic whether it is a high-, medium-, or low-income house- modeling of the individual decisions made in the house- hold; and the type of worker or person (e.g., part-time hold framework and in particular for choice of the high- worker, school child, university student, etc). To gain occupancy vehicle as travel mode. The original concept more information about a household and household of a full individual daily pattern that constituted a core composition, a record is sampled from the Public Use of the previously proposed activity-based model systems Microdata Sample. has been extended in the MORPC system to incorporate Then the core set of choice models is applied for each various intrahousehold impacts of different household household and person (Figure 1). It includes eight main members on each other, joint participation in activities linked-choice models. The numbering of Models 1 30