Progress Update on AASHTO Roadside Design Guide Revision Project
The project to review and update the AASHTO Roadside Design Guide NCHRP 20-07 (383) is well underway as indicated by the interim project report dated June 15, 2017. Various tasks such as project management, assembling the 5th edition, conducting literature reviews, and identifying guidance voids have been completed or are in progress. The project team, comprising experts from different transportation departments and organizations, has been diligently working on refining and enhancing the existing guidelines. The report outlines the accomplishments, ongoing discussions, and next steps towards finalizing the updated guide.
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Review and Update of the AASHTO Roadside Design Guide NCHRP 20-07(383) Interim Project Report June 15, 2017 Joe Jones, Principal Investigator
Introductions NCHRP Project Panel Nick Artimovich, FHWA Mark Ayton, Ontario MOT Bernie Clocksin, South Dakota DOT Keith Cota, New Hampshire DOT Paul Fossier, Louisiana DOT David Bucky Galloway, North Carolina DOT Kevin Herritt, California DOT Chris Poole, Iowa DOT Jason Siwula, Kentucky DOT Teri Soos, Maryland DOT Bill Wilson, Wyoming DOT Will Longstreet, FHWA Kelly Hardy, AASHTO 2
Task 1 Project Management Status: Ongoing Discussion: Quarterly Reports - Assemble 5th edition first 3
Task 2 Assemble RDG 5th Edition According to Current Reorganized Outline Status: Complete Discussion: What to do with the deliverable? Start writing? New and edited content will be presented in outline only for flexibility? 4
Task 3 Literature Review Status: Ongoing Discussion: Literature mostly identified Review for inclusion underway 5
Task 4 Identify Guidance Voids in, and Potential Enhancements to RDG 4th Edition Status: Complete Discussion: Ideas collected, reviewed and placement recommended. Sorted into Missing and Edit . How to deliver content? Research Statement? Blank headings? Summary to TCRS? 6
Task 4 Identify Guidance Voids in, and Potential Enhancements to RDG 4th Edition Edits: Chapter 3 Forgiving Roadside Expansion Clear Zone for Ditch Section 7
Task 4 Identify Guidance Voids in, and Potential Enhancements to RDG 4th Edition Edits: Chapter 5 Clear Zone for Ditch Section Assorted Errata LON for MASH Terminals Blockout Size and Number 350 vs. MASH requirements for MGS 8 vs. 12-in. Blockouts for MGS Definition of "Working Width" 350 vs. MASH Deflections 31-in. System Height Tolerance Pier Shielding per LRFD Tangent hardware on Curves Impact of Curbs Barrier Design on Embankment LON on Curve Short Radius Guardrail Managing Obsolete Systems 8
Task 4 Identify Guidance Voids in, and Potential Enhancements to RDG 4th Edition Edits: Chapter 6 Optimizing Median Width Cable placement in flat median Chapter 8 Terminal Grading Buried-in-Backslope Terminal LON for Buried-in-Backslope Flared End Treatments Chapter 10 Non-motorized Use of Roadsides 9
Task 4 Identify Guidance Voids in, and Potential Enhancements to RDG 4th Edition Missing: Chapter 5 Impact of Roadway Characteristics Installing Rail in Less-than-Ideal Conditions Motorcycles and Roadsides Raising Guardrail MGS Reduced Post-spacing Working Width Measuring Guardrail Height End treatments installed over curb LON on inside of curves 10
Task 4 Identify Guidance Voids in, and Potential Enhancements to RDG 4th Edition Missing: Chapter 8 Tension end terminals Chapter 9 Working Width PCB Transitions General Appropriate Use of TL-2 Hardware Hardware System Workings 11
Task 5-Review Sources of RDG 4th Edition Status: Beginning this Quarter Discussion: Likely weigh existing sources against results of literature review 12
Task 6-Develop Final Research Memorandum Status: Beginning this Quarter 13
