Evaluating Transit Equity in TODs Based On 5D Principles: A Spatial Analysis Of Portland, Oregon

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LUAN-THESIS-2025.pdf (1.92 MB)
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Luan, Jing
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School of City and Regional Planning
School established in 2010
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Theses and Dissertations
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https://hdl.handle.net/1853/78715
Abstract
This thesis evaluates the impact of Transit-Oriented Development (TOD) on transit equity in Portland, Oregon, from 2020 to 2023. Using a dual-framework of horizontal and vertical equity, the study analyzes the spatial distribution of transit-supportive environments assessed by 5D Index and transportation-disadvantaged populations calculated by Transportation Disadvantaged Index (TDI). Horizontal equity is measured through Lorenz curves and Gini coefficients, while vertical equity is examined utilizing Geographically Weighted Regression (GWR). Results show modest improvements in the overall equality of TOD features and stronger alignment between TOD investments and areas exhibiting higher levels of transit equity, particularly in east Portland. However, some regions remain underserved. The study provides a replicable method for assessing TOD equity and offers guidance for planners aiming to prioritize investments that advance transportation justice.
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2025-07-30
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