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I would like to know what placement range MwRSF is recommending for MGS behind 6" curb.  Is it going to be:

0-6 for TL2

6+ for TL2

We are in the process of documenting the recent test and making recommendations.  But our current thinking is that the 37-in. rail height relative to the roadway is valid for TL-2 and TL-3 between 4 and 12 6 feet behind the curb. For TL-2 applications, a 37-in. height is likely acceptable for a lateral offset between 1 and 12 ft. A 31-in. tall system may be installed between 0 and 1 ft from the face of a curb at MASH TL-3 impact conditions. It is anticipated that similar guidelines will be applicable for MASH TL-2 impact conditions. These conclusions are tentative and may be updated by the results of NCHRP Project 22-39. This post will subsequently be updated with the link to the final recommendations.

 We have no evidence to make any other statements about TL-2.  For example, there is no point where the rail makes the change from 31" to 37" because we do not know the valid range for the 31" rail height relative to the roadway.  There are currently no plans, or budget, to determine any other valid scenarios for MGS placement relative to a curb.  It is believed that any such determination would require additional full-scale testing.