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Suggested Citation:"5.0 Identified Needs for Future Research ." National Academies of Sciences, Engineering, and Medicine. 2018. Environmental Justice Analyses When Considering Toll Implementation or Rate Changes—Final Report. Washington, DC: The National Academies Press. doi: 10.17226/24992.
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NCHRP 08‐100: Environmental Justice Analyses When Considering Toll Implementation or Rate ChangesPage   Page 102  5.0 Identified Needs for Future Research The Research Team identified some potential areas for additional research and implementation beyond  the scope of the current study effort.     1. The content  for the Toolbox elements and  the Guidebook were designed  to be reposed as an online  resource  for practitioners.   Each  tool has attributes  that  could be  tagged or hypertext linked  to enable  searches and  facilitate  the use of  the  reference materials  in ways  that many practitioners might navigate and make use of this technical assistance resource. 2. A  data  clearinghouse would  be  very  useful  to  practitioners  and  researchers.    It  could  be  a repository of information, both robust and transparent. Key topic areas could include: 1) Survey design,  sampling approaches and  findings on attitudes and  travel behavior  for low‐income and minority populations.  The content review of toll‐related travel surveys: shown in Appendix D, Table 1 presents a list of inventoried surveys.  Further investment in  the maintenance of  the  table, but  also  establishing  a  repository of  the  supporting documents  could  assist  in  advancing  the  practice  of  pre‐and  post‐implementation monitoring  of  toll  implementation  and  rate  change  impacts.    It  could  also  improve transparency and comprehensive  reporting of  income segmentation  findings  to assess and monitor environmental justice. 2) Weighting  factors  for  travel  demand models  to  reflect  low‐income  populations  and values of time. 3. Additional  guidance  from  FHWA  on  the  appropriate  analytical methods  and  documentation requirements for evaluating toll implementation and rate changes would improve the standard of the practice in terms of preparing environmental justice assessments and ensure appropriate attention is given to potential strategies for mitigation and periodic monitoring over time: 1) Standard guidance and methods for analyzing and evaluating regional effects of tolling impacts appears  to be warranted and would be akin  to  the FTA Title VI guidance  for transit projects in the study of service equity. 2) Two  important triggering thresholds for toll  impact studies to analyze EJ  impacts could be through a requirement for periodic monitoring and reporting (e.g., every 3‐5 years) or at the time of a toll rate schedule change. Further study of the analytical and procedural features of an EJ assessment, perhaps as part of a  broader equity audit report, and how these studies would be prepared to ensure transparency  and  accountability  may  be  an  appropriate  area  of  future  research  toward  practical  implementation.   4. A series of  implementation pilots could be carried out  to  test and refine  the Guidebook steps and tools  in the Toolbox. Agencies that are on the verge of  implementing a new toll project or rate  increase  could  volunteer  to  test  the  methodologies  and  tools,  with  assistance  and observation from a third party. The pilot participants would receive expert assistance, and at the same time contribute to improving the usability and visibility of the Guidebook and Toolbox.

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TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 237: Environmental Justice Analyses When Considering Toll Implementation or Rate Changes—Final Report presents information gathered in the development of NCHRP Research Report 860: Assessing the Environmental Justice Effects of Toll Implementation or Rate Changes: Guidebook and Toolbox. This web-only document summarizes the technical research and presents the technical memorandum that documents the literature, existing case studies, resource documents, and other reports compiled.

NCHRP Research Report 860 provides a set of tools to enable analysis and measurement of the impacts of toll pricing, toll payment, toll collection technology, and other aspects of toll implementation and rate changes on low-income and minority populations.

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