We have been looking into a new single slope barrier, AGT design option, with a back taper at the bottom to reduce snagging. However, this option is not preferred because of constructability and water drainage (curb flow line consistency) concerns.
One alternative design has recently been proposed. It uses an 8-inch high curb with a front face at the same slope as the single slope barrier. The gap between the top of the 8-inch curb and the bottom of the thrie-beam would be 3-inches. The curb would tapper to a 4-inch curb (or to zero) before the W-to-thrie transition element.
Attached is a draft drawing showing this design approach. We would like to know if this would reduce the snagging issues at the concrete end, similar to a back tapper design.
Let me know if you need any further information.
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