The TRB Transit Cooperative Research Program's TCRP Web-Only Document 74: Recent Decline in Public Transportation Ridership: Hypotheses, Methodologies, and Detailed City-by-City Results provides supplemental information to TCRP Research Report 231: Recent Decline in Public Transportation Ridership: Analysis, Causes, and Responses, which delves into exploring ridership losses already being experienced by transit systems prior to the COVID-19 pandemic.
National Academies of Sciences, Engineering, and Medicine. 2022. Recent Decline in Public Transportation Ridership: Hypotheses, Methodologies, and Detailed City-by-City Results. Washington, DC: The National Academies Press. https://doi.org/10.17226/26494.
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