Integrated Urban Models for Simulation of Transit and Land-Use Policies Final Report (1998) / Chapter Skim
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1.0 Introduction
1.0 Introduction
Pages 25-34
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From page 25... ...
Accompanying this report are Guidelines for Implementation and Use of integrated models. The Guidelines describe how Amos, State DOTs arid other planning agencies can act today, in order to initiate or build upon existing integrated transportation - Arouse models.
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"Data" represent the inputs and the outputs, without which the aigori~ms neither function nor provide mearungful results. Travel demand forecasting models me used to predict travel on a transportation network.
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Before proceeding ~ ~ detailed discussion of integrate urban models, the question surely needs to be addressed of why do we need integrated models at all, especially given their historical absence from urban transportation planning in most cities? Traditionally, most urban areas have used some form of four-staae travel dem=d modeling system which simply takes population and employment forecasts generated "elsewhere" as exogenous, fixed inputs.
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From page 28... ...
approach to tackling a difficult problem, especially in the first instance, is to decompose it into smaller, more manageable sub-problems. It is therefore, very understandable that researchers have tended to work on bits and pieces of the problem: Improvements to work trip mode choice models; empirical studies of micro urban design factors on travel demand; residential location choice models; etc.
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From page 29... ...
etch. In addition, it is important to note that our technical capabilities with respect to: · computer hardware (both processing speed arid data storage capabilities)
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or a net negative impact (due to increased induced sprawl of landuse and travel patterns Increased auto dependency, etc.~. A recent "blue ribbons panel in the United States came to no definitive conclusion on this issue tCSTHCIAQEC, 199~]
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From page 31... ...
In addition to their role as forecastinaJpolicy analysis tools integrated transportation - landuse models also have the potential of providing an experimental platform/laboratory for exploring transportation - land-use interactions so that we can better understand the dynamics/relationships involved and hence better craft our policies. At least one reason why the empirical literature discussed In Chapter 3 is so mixed arid why we don't know more than we do about this interaction is because we never have enough empirical data to analyze the problem in sufficiently deep ~rays.
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Certainly, a strong case can also be made that the relatively limited impact which even disaggregate logit mode choice models have had on travel demand modeling practice can be traced in large measure to the difficulty of projecting the population socio-econom~c attributes required for these models to operate most effectively Emitter 1996]
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From page 33... ...
Throughout this report special consideration is given to the role which public transit plays, both within the integrated urban models under discussion and, more important, within the transportation - lar~d-use interaction. This focus is most explicit in the context-setting Chapters 2 arid 3.
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From page 34... ...
ACRE H-12 Final Report - 10
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Key Terms
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