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The Effect Of Housing Near Transit Stations On Vehicle Trip Rates And Transit Trip Generation

In order to show the ridership benefits of TOD, we examined the best empirical information available for adjusting vehicle trip generation rates and estimating transit ridership. Fortunately, a fair amount of empirical evidence has been gathered in California over the past decade on TOD’s ridership impacts. The approach taken parallels somewhat that employed for the Air Resources Board’s URBEMIS model that aims to evaluate the potential emission-reduction benefits of smart-growth strategies. The URBEMIS model provides a range of “adjustment factors” for reducing estimated vehicle trip volumes by specific percentages based on characteristics of built environments – including the 3Ds of density, diversity, and design. We propose that the evaluative tool, like URBEMIS, will begin with standard ITE vehicle trip generation rates to estimate the potential reductions in vehicle use a TOD offers compared to a conventional suburban development (the basis of the most use ITE trip rates).