United States Department of Transportation
i
Developing a New Barrier Condition Index (BCI) to Optimize Barrier Improvements in Wyoming
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2020-03-01
[PDF-5.75 MB]
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Edition:Final Report
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Abstract:Traffic barriers are installed on roadsides and medians to shield motorists from hazardous objects and other vehicles. Due to the important role played by traffic barriers in promoting safety, it is important to continuously assess their condition and performance. This study prioritized and ranked traffic barriers on Wyoming’s highways for safety improvement by enhancing the height of barriers below recommended thresholds. This was achieved by conducting a benefit-cost analysis to estimate the reduction in crashes that would be gained by adjusting barrier heights. The analysis indicated that substantial benefits would be accrued if barrier heights are optimized. Traffic barriers on Wyoming’s highways were then ranked based on the estimated benefits. As part of the study, a safety evaluation was carried out to identify the geometric factors of traffic barriers that impact crash severity. Finally, a condition assessment procedure referred to as the Barrier Condition Index (BCI) was used to demonstrate a new approach in the condition assessment, rating, and prioritization of traffic barriers.
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