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Geometric Design Strategic Research Program

This presentation outlines the work of the TRB Geometric Design Committee and their focus on expanding the body of knowledge regarding highway and street geometric design elements. It includes opportunities for collaboration and highlights current and updated research needs.

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Geometric Design Strategic Research Program

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  1. Geometric Design Strategic Research Program Transportation Research Board AFB10 Geometric Design Committee Brian L. Ray, PE Committee Chair July 27, 2010

  2. What have we heard so far? • Freight design criteria • Complete Streets • 2015 Green Book Topics • Highway Safety Manual • Flexibility in preliminary Engineering • Right sized projects • Urban street design standards • Practical Design • Others?

  3. What will be the basis of our design decisions? RESEARCH!

  4. Presentation Outline • Overview of the TRB Geometric Design Committee • Geometric Design Strategic Research • Opportunities for Collaboration

  5. Committee Scope Expanding the body of knowledge regarding highway and street geometric design elements that affect safe and efficient operations for all users. Developing research needs statements and communicating findings that advance geometric design criteria, guidance, methods, and performance-based design objectives. Facilitating domestic and international dialogues and idea exchanges while supporting emerging and developing professionals

  6. Committee Structure • Research Subcommittee purpose • Coordinate and manage the strategic research program • Produce the research needs statements using the input from others

  7. Committee Structure • Technical Subcommittee purpose • Conduct activities that lead our exploration of technical issues and priorities. • Subgroups: • Streets and Intersections; • Highways; • Freeways and Interchanges; and • Methodology

  8. Committee Structure • Business Subcommittee purpose • Execute reoccurring and ad-hoc committee business • Conduct outreach to external sources in support of committee business, • Coordinate special assignments and forums as they arise

  9. AASHTO Members • Jim Brewer/Kansas • Bart Thrasher/Virginia

  10. Presentation Outline • Overview of the TRB Geometric Design Committee • Geometric Design Strategic Research • Opportunities for Collaboration

  11. Current Research Needs Documentation http://onlinepubs.trb.org/onlinepubs/circulars/ec110.pdf Transportation E-Circular (E-C110) 22 research needs statements

  12. Research Needs Development Process TRB Committees on Geometric Design (AFB10) & Operational Effects of Geometrics (AHB65) & AASHTO Technical Committee on Geometric Design “Re-thinking” Design Process Design Controls/Criteria User/Vehicle Controls Rural Highways Freeways/Interchanges Urban Streets Intersections

  13. “Original” Research Needs

  14. Funded Synthesis Statements Topic 40-07: Trade-off Considerations in Highway Geometric Design Topic 40-08: Effective Speed Reduction Techniques for Rural High to Low Speed Transitions Topic 41-01: Geometric Design Practices for Resurfacing, Restoration, and Rehabilitation

  15. UPDATING STRATEGIC RESEARCH NEEDSJuly 2009 Mid-year meeting

  16. Process • Form four technical subgroups: • Methodology • Highways • Freeways and Interchanges • Streets and Intersections • Review and update existing white papers • Review and update unfunded research needs statements • Identify emerging topics

  17. PRIORITIZED RESEARCH NEEDS AFB10/AHB65

  18. Methodology/Design Controls Critical assessment of geometric design policies and practices Safety effects of intersection sight distance Updating decision sight distance criteria Applying geometric design criteria in intermediate speed range Forgiving roadside design (coordinate with AFB20) Bicycle safety prediction methodology

  19. Highways *Developed and considered by AASHTO Safety evaluation of 13 controlling criteria* Study of vehicle paths on horizontal curve transitions* Speed prediction models for multilane rural/suburban highways Speed prediction models for trucks Relationship between safety, roadway lighting, and geometric design features AFB10/AHB65

  20. Freeways and Interchanges *Developed and considered by AASHTO Integrated Ramp and Ramp Terminal Design* Multilane Loop Ramp Design* Allocation of Freeway Lane and Shoulder Widths AFB10/AHB65

  21. Streets and Intersections *Developed and considered by AASHTO Auxiliary Turn Lane Design Guidance and Policy Upgrades* Safety effects and implementation of intersection skew angles Intersection design and evaluation guidebook Comprehensive roadway design for complete streets AFB10/AHB65

  22. Synthesis Topics Design and maintenance of traffic during construction Curve and cross-section design on temporary facilities Truck facility design (marshaling yards, truck-only ramps) Highway design to support traffic enforcement Barrier toll plaza vs. open-road tolling design Current practices for provision of sidewalks Vertical pavement profiles at intersections Crosswalk cross-slope design practices AFB10/AHB65

  23. “Updated” Research Program

  24. Presentation Outline • Overview of the TRB Geometric Design Committee • Geometric Design Strategic Research • Opportunities for Collaboration

  25. In general… Support the effort to update Transportation Research E-circular Provide input and support on existing and new research needs statements and synthesis topics Share ideas on Green Book revision and other research needs

  26. 2010 and 2011… • Share results of Green Book needs discussion from this SCOD meeting • Obtain input from 2010 Green Book update effort • Identify other emerging needs • Plan for the joint Mid-year 2011 meeting with TRB and AASHTO Technical Committee on Geometric Design

  27. Questions? Interested? Contact: Brian Ray Kittelson & Associates, Inc. bray@kittelson.com

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