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Looking into this application further, we believe that the MGS can be safely used with W-beam and blockouts on both sides in a median barrier configuration. This is based on the following:

1. Several of the existing 31" high guardrail designs have been successfully tested in median configurations. These include the NUCOR NU-GUARD 31 and the Gregory GMS 31. Both of these systems did not use blockouts and the Gregory system was tested with the splices at the posts. An MGS median system would be specified with splices away from the posts and 12" blockouts as used on the standard roadside system. This should increase the rail capacity and reduce snag as compared to the existing tested 31" high median guardrail systems.
2. While the stiffness of the MGS guardrail system would increase due to the use of front and backside w-beam rails, we do not believe that this is cause for concern. The MGS was successfully tested with ¼ post spacing which is would be much stiffer and have much lower deflections than an MGS median system with the additional w-beam rail. Thus, the additional stiffness of the system is not a concern.
3. You noted in our discussion that the system would be installed on the edge of shoulder and not in the 6:1 median ditch. As such, there should be no concerns with vehicle compatibility.

Based on the above statements, we believe that the MGS can safely be used in a median installation. MwRSF will also seek formal FHWA approval of a median MGS system if Ohio or the other Midwest Pooled Fund States so desire.