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Enhancing Guardrail Standards for Road Safety in Tennessee

Learn about the implementation of MASH standards for guardrails, including new designs and evaluations for improved roadside safety. Explore terminal details, bridge parapet transitions, and future work in this comprehensive update.

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Enhancing Guardrail Standards for Road Safety in Tennessee

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  1. Implementation of MASH Ali Hangul, P.E. Tennessee Department of Transportation

  2. Guardrail Standards

  3. At The beginning of MASH

  4. TXDOT research at TTI passed MASH using 36” barrier height 31” w-beam GR with 8 blackout tested for a small vehicle by TTI for TXDOT

  5. 31” w-beam GR with 8 blackout tested for a small vehicle by TTI for TXDOT • 31” w-beam GR in slope TTI completed for Roadside Safety Pooled Fund 6:1 6’ post 4:1 7’ post 3:1 8’ post 2:1 9’ post 1:1 11’ post Pooled Fund Study : “Placement of Guardrail on Slopes” Phase III: New Guardrail Design for Placement on 1H:1V Slopes

  6. Updated Standard drawing

  7. Updated Standard drawing

  8. TL-3 Tangential GR end terminals (Proprietary items) • Two models reevaluated per NCHRP 350 for 31” (Confusing for users) • One new design evaluated per MASH for 31” (One point to consider, MASH does not require 31” installation height) • Waiting for two additional manufacturers to have their products being evaluated. Than the Department can adopedMASH exclusively. Terminals

  9. Recently TTI completed a study for TX DOT Downstream End Terminals

  10. Downstream Terminal detail

  11. TXDOT Standard

  12. TDOT Standard Initial detail

  13. Revised Standard, further adjusted wood post length

  14. Currently no MASH evaluation (TL-2) is proposed for slotted flared terminal

  15. 31”Bridge parapet transition Current Issue • Working processDesign and NCHRP Report 350 Finite Element Analysis of Stacked W-Beam Transition for 31-inch Guardrail (601721)

  16. Currently the only alternative is adopting thrie beam transition detail developed by TXDOT

  17. Buried in Back slope terminal anchor

  18. Simulation completed for NCHRP 350 TL-3 at 31” further evaluation is needed for MASH

  19. Tangential Guardrail End TerminalsInitial revision did not address the special GR length as well as payment length

  20. Revised to show terminal Payment length to 46’-10 ½”

  21. Study has been done, needs FHWA Eligibility Letter

  22. Concrete Bridge Rail/Median Barrier

  23. TDOT Current Concrete Barrier Wall Standard

  24. Future Work

  25. Thank you ALI R. HANGUL P.E., CPESC| Assistant Director Headquarters Roadway Design and Office of Aerial Surveys James K. Polk Bldg, 13th Floor,            505 Deaderick St., Nashville, TN 37243 Phone No. 615-741-0840 ali.hangul@tn.gov tn.gov/tdot

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