A question has come up regarding the MnDOT Combination Traffic/Bicycle Bridge Rail that MwRSF tested for MnDOT in 1998. This railing was tested as a “breakaway” railing mounted on a 32” tall J or F barrier and passed for TL-4. The link below is from your website and provides more info regarding the railing and the test.
https://mwrsf.unl.edu/reportresult.php?reportId=100&search-textbox=minnesota
As you may know, MnDOT has now transitioned to using a 36” tall single slope barrier with an 11 degree front face slope (example plan sheet attached). We also have standards for a 42” and 54” tall single slope barrier, all meeting TL-4 NCHRP 350 (waiting for eligibility letter from TTI and FHWA to approve as MASH barriers). The new barrier standard is used in conjunction with the MGS 31” tall guardrail.
The question is, can we use the combination traffic/bicycle bridge rail mounted on the back of a 36” tall single slope barrier and still refer to it as approved for TL-4 NCHRP 350?
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