Urban Transportation and Logistics

235Urban Transport and Logistics in Cases of Natural Disasters

The matrix presented in the gure shows that risks can be roughly

classied into different categories depending on the parameters on the

two axes. The different categories of risks require different ranks of

control action. Priority on control actions can be determined by the

adoption of this kind of decision-making tool. According to Yeh (1999),

the most common risk management strategies can be divided into three

categories: retention, mitigation, and transfer, which are described in

detail next.

Risk retention refers to risk that is borne by the sufferer alone due to

the inability to transfer or impossibility of transferring that risk to oth-

ers. In the risk retention principle, ...