Guide for the Preservation of Highway Tunnel Systems (2015) / Chapter Skim
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Pages 40-45
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40 6.1 Use of the Metric in Prioritization The process outlined in Chapter 5 uses a simple metric that provides the basis for comparison of numerous alternatives to establish present and future priorities and for comparison of pres ervation actions in a single tunnel versus all tunnels in a certain region or over the entire tunnel system. The metric uses the combination of three scores into one MOE and allows each alter native activity to be weighted against the others and the priorities to be established.
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Prioritization of Preservation Actions 41 fire alarm upgrades, supervisory control and data acquisition (SCADA) systems, and different methods of wall repair.
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42 Guide for the Preservation of Highway Tunnel Systems Levels of Service Reliability Safety Security Preservation Quality ofService Environment LOS Score (Eq.
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Prioritization of Preservation Actions 43 While the use of the metric for lighting replacement alternatives compared three similar types of preservation actions, the metric can also be used to evaluate repairing or replacing tunnel systems or structural components, as highlighted in the example in the next section. 6.2.2 Ceiling Improvement -- Repair Versus Replacement The previous example compared the use of varying materials to accomplish one improvement in the tunnel -- a lighting upgrade.
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44 Guide for the Preservation of Highway Tunnel Systems spalling concrete for a period of time, the agency has experienced situations where the repair eventually failed as well. These failures resulted in unsafe conditions and caused the agency to close the tunnel to make repairs.
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Prioritization of Preservation Actions 45 Although the ceiling removal option receives a low CE score, Agency X weighted costeffectiveness as only 20% due to its high priority on safety and emphasis on minimizing risk (see Table 69)
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