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Risk-Based Transportation Asset Management: Building Resilience into Transportation Assets
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    This is the fifth of five reports examining how risk management complements asset management. This last report examines how physical, climatic, seismic and other external threats can be addressed in risk-based asset management programs. The first four reports and the literature review emphasized the definition of risk as the positive or negative effect of uncertainty or variability upon agency objectives. Those reports emphasized that risks could be positive in that some types of uncertainty can create opportunities. However, this report will focus more on negative risks, or threats. These risks generally are external, and while highly probable over a long period of time, are difficult to predict in the short term. Randomness and variability complicate planning for them. In August 2011, Hurricane Irene reached one of the nation's most northern states, Vermont, and damaged 480 bridges out of a total network of 2717 bridges. In one day, more bridge deterioration occurred than normally would occur over many years. Accurate prediction of such events is nearly impossible. Such a significant storm had not struck Vermont for 83 years. In managing risks to assets from external threats, this report emphasizes the Three Rs, which are Redundancy, Robustness and Resiliency. These will be defined, described and illustrated through several agency examples. Asset management plays a critical role in each, particularly Robustness and Resiliency. Including the Three Rs in asset planning efforts can better prepare agencies to cope with an increasingly unpredictable world.

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