A safety project on a narrow two-lane road will require certain locations to be shielded with guardrail. On this particular road, there is neither a shoulder nor any useable flat area to offset the barrier from the edge of traveled way. A 12 in. offset to the face of the rail was chosen so as not to further constrict the width of the traveled way which is as narrow as 9 ft. in certain locations. As shown in the attached figure, a 2H:1V inslope begins immediately at the edge of pavement, resulting in nearly 1.25 ft. of additional exposure/decreased embedment.
Since this arrangement would yield more post exposed than embedded, it is not likely to be acceptable at the 7 ft. post length as shown.
Question: Could a guardrail system with 9 ft. posts on 3 ft. 1-1/2 in. spacing, placed 24 in. down a 2H:1V slope be reasonably expected to perform at MASH TL-3?
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