Criteria for Restoration of Longitudinal Barriers (2010) / Chapter Skim
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The literature review focused on available national guardrail repair guidance and individual agency guidelines for the repair and maintenance of semi-rigid and flexible longitudinal barriers. These individual agency guidelines generally fell into two categories: (1)
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Other examples of guardrail damage requiring repair include "sections torn loose from posts," "rail section flattened," or an "anchor at either end of a run broken loose." 2.3.2 Published State Transportation Agency Guidelines for Damaged Barrier Repair The literature review included published guidelines from 26 U.S. state transportation agencies relating to the maintenance and/or performance assessment of longitudinal barrier.
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Also evident from this literature review is the variation between maintenance manuals and maintenance assessment criteria even within the same jurisdiction. For instance, North Carolina had quantitative barrier repair guidelines in the maintenance manual but no quantitative guidelines for maintenance assessment (see Table 2)
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The overall number of criteria pertaining to cable barriers, however, was substantially less than that of metal beam barriers. Notable differences include criteria for cable sag which varies from 38 mm (1.5 inches, Iowa maintenance assessment)
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Summary of quantitative damaged barrier criteria: metal beam barrier post and blockouts. Maintenance Maintenance Assessment Category Type Criteria Description FH W A (2 00 8)
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X Rail Element Deterioration Cable sag > 152 mm (6 in.) X Deflection Post angle > 15° angle from vertical X 1 or more broken posts X X X 3 or more consecutive posts missing/broken X Missing first 2 posts adjacent to anchor(s)
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Agency guardrail repair priorities by damage type. 17 19 23 30 30 36 37 39 41 50 0 10 20 30 40 50 60 Missing bolts/hardware Missing Blockout Snowplow damage Cable Sag Loss of tension (cable barrier)
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In addition, the survey responses suggest that transportation agencies would see a benefit in more quantitative barrier repair guidelines. Second is the apparent variation between barrier assessment criteria, as present in maintenance assessment procedures, and those criteria used to determine the need for barrier repair, as prescribed in the maintenance manual.
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