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Extra Blocks on MGS Approach Transition

Question
State WI
Description Text

I spent sometime looking at the Q and A site looking for guidance on having extra blocks on an approach transition.


If my memory serves, I did not think that MwRSF was keen on adding blocks on an approach transition.



Approach Guardrail Transitions (AGTs)



Date June 1, 2020
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We have been of the option that double blockouts in a transition area would not affect the system performance.  Transitions don’t deflect much, so the posts shouldn’t twist or fail prematurly, and deeper blockouts would help with vehilce–to-post snag.  However, we are skeptical of triple blockouts (24” and up), and have recommended the use of triple blockouts to 1 post location per 50-ft until further evaluation is conducted.


Date June 1, 2020
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How deep was “SuperBlock” in Des Moines, Iowa?


Date June 2, 2020
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First off, we did not like “Superblock”.  I believe they wanted to use up to 48” of blockout at 3-5 post locations adjacent to the bridge rail. 


Date June 3, 2020
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If a double blockout is used, do all the blockouts in the transition need to be doubled? or certain number of adjacent blockouts also need to be doubled?

Date January 13, 2023
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You do not need to double block an entire system.  Double blocks may be used on only 1 or 2 posts were the obstruction is located.


Date January 18, 2023
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