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

2. Guardrail Standards

3. At The beginning of MASH

5. 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

6. Pooled Fund Study : “Placement of Guardrail on Slopes”
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

7. Updated Standard drawing

8. Updated Standard drawing

9. Terminals 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 adoped MASH exclusively.

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

11. Downstream Terminal detail

12. TXDOT Standard

13. TDOT Standard
Initial detail

14. Revised Standard, further adjusted wood post length

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

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

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

18. Buried in Back slope terminal anchor

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

20. Tangential Guardrail End Terminals Initial revision did not address the special GR length as well as payment length

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

22. Study has been done, needs FHWA Eligibility Letter

23. Concrete Bridge Rail/Median Barrier

24. TDOT Current Concrete Barrier Wall Standard

25. Roadside Safety Pooled Fund Program Research Problem Statement
Future Work
Roadside Safety Pooled Fund Program
Research Problem Statement
State:
Texas
Title:
MASH Coordination effort
Problem Statement:
As we approach MASH implementation agreement sunset dates for NCHRP 350 devices many entities, individual state DOT’s, Pooled funds, and private industry, will be crash testing highway safety devices to MASH standards. Currently, DOT’s don’t have a reliable method to know what other DOT’s have tested and are working on testing. This environment of each state working in a vacuum is not conducive to planning and may lead duplicate efforts, wasted time and money.
Objectives of the Study:
The objective of the study is to create a database of MASH tested devices, proposed testing and DOT needs for MASH testing. The database should be accessible to all state DOT’s or at least a representative of each state. Also, a recommended procedure for updating the database should be part of the deliverable.
Expected Benefits:
The benefits of this project would be that it would provide State DOT’s the opportunity to better plan their tests, reduce the risk of duplicate efforts and provide an opportunity for collaboration between states on mutually beneficial projects.
Description of the Proposed Feature to be Tested: (Be as detailed as possible. Include drawings and/or plans, if available.)
The database could be a spreadsheet that is maintained by an individual and updated and ed to contacts monthly, a website, spreadsheet or application that is accessible for edit to approved persons from each state, or any other format that would allow the information to be shared and updated.
Estimated Cost (of the feature per linear foot installed):
Total Estimated Cost of Crash Test:
Contact Person:
Chris Lindsey
Telephone:

26. 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
tn.gov/tdot