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Iowa Transition Design Adaptation

Question
State IA
Description Text

Not that Iowa is unwilling to change, but how would our current design be modified to apply the findings of your recent project?  I have attached the most up-to-date version of our metric-height transition.  If this becomes too complicated, we have no reservations about switching to the bigger posts and wider post spacing.


Approach Guardrail Transitions (AGTs)
Thrie Beam Guardrails
W-beam Guardrails


Transition and Attachment Structures
Date May 18, 2009
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Attachment Iowa Transition Design Adaptation.pdf
Response
Response
(active)

I have attached a PDF containing MwRSF's recommendations for the transition to the Iowa transition. 

 

The top configuration is the one you sent us yesterday.

The bottom configuration is the transition to the transition that MwRSF tested last year.

 

The middle configuration takes the 7-ft posts @ 18.75" spacing from the Iowa transition and adds the MwRSF transition to the transition on the upstream end.  Note, the U.S. end is now MGS rail and the W " to " thrie transition element has been updated accordingly
Date May 19, 2009
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Attachment Iowa Transition Design Adaptation.pdf