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6 introductory chapter provides an overview of the project, Relationship to Other Documents including background information. Chapters two through six provide summaries and relevant tables and figures of the Results from the research synthesized in this document rec- findings from the literature. These chapters are organized to ommended a number of changes to the AASHTO Green Book, match the presentation of material in the Green Book: the Manual on Uniform Traffic Control Devices (MUTCD), and other guidance documents. The research also produced two FHWA Informational Guides on roundabouts and con- Chapter two--Design Controls and Criteria tributed to other guides on access management, pedestrian Chapter three--Elements of Design and bicycle accommodation, designing for older drivers, the Chapter four--Cross-Section Elements Highway Capacity Manual (HCM), and the Highway Safety Chapter five--Intersections Manual. Discussion of the relationship between this synthesis Chapter six--Interchanges report and other documents, along with relevant cross refer- ences, is also provided. The final chapter of the report is a summary of key find- ings from the literature, along with potential issues to be con- It should be emphasized that this synthesis report does sidered for future research. not contain the applicable policies or design tools; it is con- fined to summarizing the literature. References to appropriate It is important to note that the recommendations included research reports, policies, and guidance documents are provided in the findings from the literature throughout this report are throughout the document, compiled into a comprehensive list those of the authors cited. Before any revisions to AASHTO's of references, which follows the Conclusions (chapter seven). Green Book were to be made on the basis of these recom- Additional, relevant sources are provided in a Bibliography mendations, they would need to be considered on the basis following the References; these sources are not specifically of the rigor of the research and logic that underlie them. No included in the body of the report, but may provide readers endorsement of these recommendations is implied by their additional information on issues and topics relevant to those inclusion in the findings from the literature. contained in the report.