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Modified Thrie Beam Transition to Concrete Barrier

Question
State	IN
Description Text	Is there currently a thrie beam transitions recommended to transition between modified thrie beam guardrail and concrete barrier? INDOT currently using the Standard Drawing E601-TMTT-01, see attachment or https://www.in.gov/dot/div/contracts/standards/drawings/sep25/600e/e600%20combined%20pdfs/E601-TMTT.pdf. Would this transition be acceptable? If this transition was used in a median application, could we consider double siding the transition? Thank you

Question

State

Description Text

Is there currently a thrie beam transitions recommended to transition between modified thrie beam guardrail and concrete barrier? INDOT currently using the Standard Drawing E601-TMTT-01, see attachment or https://www.in.gov/dot/div/contracts/standards/drawings/sep25/600e/e600%20combined%20pdfs/E601-TMTT.pdf.

Would this transition be acceptable? If this transition was used in a median application, could we consider double siding the transition? Thank you

System Performance Evaluation
MASH
NCHRP 350
TL-3

System Types
Approach Guardrail Transitions (AGTs)
Stiffness and Height Transitions
Thrie Beam Guardrails

Applications
Median Barriers

System Features
Thrie Beam

Date January 2, 2026
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Attachment INDOT_Standard_Drawing_E_601-TMTT.pdf

Response
Response ()	MwRSF provided recommendations for transitioning modified thrie beam in the Section 9.4 of the summary report for the modified thrie beam MASH compliance testing. See link below. https://mwrsf.unl.edu/researchhub/files/Report381/TRP-03-417-20.pdf Thanks!

Response

Response
()

MwRSF provided recommendations for transitioning modified thrie beam in the Section 9.4 of the summary report for the modified thrie beam MASH compliance testing.

See link below.

https://mwrsf.unl.edu/researchhub/files/Report381/TRP-03-417-20.pdf

Thanks!

Date January 27, 2026
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