Bureau of Materials and Research 2014 AASHTO RAC/TRB Annual Meeting High Value Research Sweet 16 Ann Scholz, P.E., Assistant Research Engineer

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Presentation transcript:

Bureau of Materials and Research 2014 AASHTO RAC/TRB Annual Meeting High Value Research Sweet 16 Ann Scholz, P.E., Assistant Research Engineer

Roadway resurfacing reduced the height of the guardrail relative to the roadway Reduced height did not meet AASHTO’s Roadside Design Guide Resetting guardrail post added significant expense to pavement overlay projects Performance of W-Beam Guardrail after Height Adjustment

Why Research? Hey Boss. What’s the allowable range of height for a W- beam guardrail? Hmmmm, let me check with the FHWA Safety Office New “unofficial” guidance is 27” Top of Rail +3”/-1”

Research Findings Topic investigation revealed possible solutions from: Proposed use of WSDOT detail with FHWA-NH:

Proposed changes from traditional work Standard detail for resetting offset block on existing wood post

Proof of Concept FHWA-NH required: Two-year field study on installations Evaluate in-service performance Compare to traditional methods Photograph and document Summarize finding into a report Provide donuts and coffee Namesake your first born Kind words to D.C. Kiss a frog Etc. Computer simulation by George Washington University

Research approved November 2009 – National Crash Analysis Center study was released documenting the successful computer simulation providing additional confirmation of the anticipated performance. Summer 2010 through Fall Field in- service evaluations proved successful June 2012 – Highway Design provides special detail for projects

Implementation Strategy

Value of Implementing the Research Highway safety was not compromised as evidenced by several accidental hits and review of available crash reports

Value of Implementing the Research $5,200,000 savings from Spring 2009 through Fall 2013.

Value of Implementing the Research In addition to direct costs, projects required less time for completion which resulted in additional savings from other contract items: Uniformed officers Flaggers Maintenance of traffic Temporary and portable signage

Return on Investment

Thank you Region 1 for your recognition Acknowledgements: Mike Hazlett, NHDOT Highway Design – driving force Don Coleman, NHDOT Construction – initial review Julie Fowler, NHDOT Research – field monitor and report Marty Calawa, FHWA – support and guidance