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I work as a
designer for Caltrans. One of the challenges my team is facing now is designing
ADA improvements on and near Caltrans facilities.

One of our
designs proposes a 4-foot wide sidewalk in front of guard rail. I have seen
test reports and photos of MGS behind 6-inch curb. Are there any data or
recommendations when the MGS is placed behind 6-inch curb and a sidewalk ?

We have done some work with investigation of the MGS system with larger offsets from the curb. We did not achieve a comprehensive set of curb guidelines, but we did get some results that may help you.

I have attached references to that work. They may not answer all of you questions, but they should give you a start.

http://mwrsf.unl.edu/researchhub/files/Report72/TRP-03-205-09.pdf

http://mwrsf.unl.edu/researchhub/files/Report56/TRP-03-221-09.pdf

http://mwrsf.unl.edu/researchhub/files/Report47/TRP-03-237-10.pdf

Let me know if you have further questions.