Attached to this question are two PDFs, Bridge Railing Modification Detail 1 and Detail 2. In the PDF Bridge Railing Modification Detail 1, can the concrete parapet wall section be reduced to 18” and retain the single steel tube at a height of 36"? There is a similar railing (PDF Bridge Railing Modification Detail 2) that uses an 18” concrete parapet, but has 2 steel tubes, top tube height of 42".
Would reducing the height of the concrete parapet and retaining the single steel tube at 36" on the BR27C Flush Mounted Bridge Railing (attached Detail 1) likely have performance implications? If possible can you comment specifically related to test levels 4 and 2?
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