Impact Methodologies

Distribution of Impacts

Case Studies

Sacramento, California

A consumer welfare model is used to estimate per-trip user benefits by income group under alternative scenarios.

San Francisco Bay Area, California

Accessibility of residents to employment is compared for "disadvantaged" versus "non-disadvantaged" neighborhoods for the Regional Transportation Plan versus the no-plan alternative. Statistical tests are applied to measure the significance of differences.

SPARTACUS (Europe)

Transportation-related emissions and noise data are disaggregated within a GIS raster (grid cell) environment and their coincidence with population is measured. Exposure is measured by socioeconomic group to develop indicators of equity.

Tren Urbano, Puerto Rico

Accessibility is compared by mode (automobile, rail transit, and bus) and across five income groups to analyze the equity impacts of the Tren Urbano rail transit project.

Waterloo, Iowa

GIS is used in conjunction with emissions and noise models to plot emissions and noise contours around transportation facilities. These are then overlaid on minority and low-income population data to develop measures of environmental justice.

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