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BREAKOUT SESSION Land Use Forecast J. Douglas Hunt, University of Calgary, Canada Paul Waddell, University of Washington Becky Knudson, Oregon Department of Transportation represent one approach. Other feedback forms focus on THE CASE FOR INTEGRATED interchange disutilities and integrated models. Transport LAND USETRANSPORT MODELING costs, with price signal changes influencing activities, represent another possible approach. J. Douglas Hunt Modeling tasks are best described as forecasting to support facility design. Policy analysis is supported by Douglas Hunt discussed the use of integrated land modeling how future changes arise in response to differing usetransport models. He defined different elements assumptions. Modeling imposes discipline and there are a associated with integrated land usetransport models, variety of legal reasons for justifying the use of integrated described examples of feedback forms, provided a ratio- land usetransport models. Essentially, land usetransport nale for integrated land usetransport models, and models provide a more complete representation of the real described potential applications of integrated land world, a more holistic or organic perspective, and thus usetransport models. Douglas covered the following avoid the philosophy of line-process modeling. points in his presentation. Integrated land usetransport models can be used for many different types of studies and have numerous Understanding the different definitions associated benefits. Integrated land usetransport models can sup- with the application of integrated land usetransport mod- port policy studies, planning assessments, and design els is important. The transportation system is the interac- analyses. Land usetransport models provide a more tion between supply and demand that acts on price signals. complete representation of the real world, which can A spatial activity system is supply meeting the demands of enhance future planning and decision making. Examples that system. How to characterize the land use system is an of instances in which integrated land usetransport mod- important consideration. Land use system is probably not els were not used raise some concerns regarding the con- the appropriate term, but was acceptable when invento- clusions that were derived. ries were measured by square footages. Land use system is a loose and inappropriate term for spatial economic sys- tems. Line-process modeling addresses transportation CHALLENGES IN INTEGRATED LAND USE AND components in a sequential manner, such as the traditional TRANSPORTATION MODELING: LESSONS FROM four-step model, whereas land usetransport interaction URBANSIM EXPERIENCE modeling incorporates critical feedbacks. Feedback is a key element of land usetransport Paul Waddell interaction modeling. A number of different feedback forms may be used. Location accessibilities, which Paul Waddell discussed the use of the UrbanSim integrated involve using log-sums to express relative accessibility, land use model. He described some of the factors that 24