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High-Tension Median Cable In-Service Performance Evaluation and Cost-Effectiveness Analysis

Cross median crashes (CMC) are typically violent collisions with a disproportionately high probability of fatalities and injuries. Applying median barriers might be a potential solution to reduce the number of CMCs and their severities. Past studies overwhelmingly indicate that installing cable barriers is the right choice for preventing CMCs from occurring. As part of the exploration of system-wide cable implementation and development of predictive cable median barrier warrants, a comprehensive cable barrier evaluation was conducted in Wisconsin. Initial data analysis shows that median-related crashes, a portion of run-off-the-road crashes, are frequently weather related (usually during snow or ice conditions), but less severe. Before and after comparisons of crash counts and crash rates imply that more median related crashes, especially property damage only (PDO) crashes, occurred after cable installation, but overall crash severities were reduced significantly. Moreover, median cable in-service performance with the emphasis on several high tension cable guards (HTCG) was thoroughly assessed through analyzing archived cable maintenance logs. In most categories, high-tension cable systems outperformed low-tension cable in repaired man-hours, average cost per hit and vehicle penetration rate. Cost benefit analysis shows high values of benefit to cost (B/C) ratios at almost all tested sites, recommending high-tension cables as an excellent solution for preventing CMC and reducing crash severities. Finally, the generation of cost per hit and unit cost of cable operations and maintenance (O&M) per mile can assist WisDOT in making an informed decision about system-wide cable installation.