Conceptual in its approach and drawing from other areas of research, this paper introduces four distinct groups of VENS, namely Constrained, Directed, Limited and Free VEN, and concludes that VEN risk management can and should learn from supply chain risk management.
This is a philosophical essay on transportation vulnerability, where three fields or subjects are brought together : engineering (reliability and vulnerability), economics (cost and benefits) and politics (decision making).The research essay aims at taking reliability and vulnerability into the realm of cost-benefit analysis to serve as decision support.
To make the supply chain more resilient, businesses need to do more than just think about the problem; they must prepare to act effectively, and find the optimal tradeoff between disruption costs and mitigation costs.
The increase in generalised travel costs weighted by the satisfied or unsatisfied demand when network links are closed is used as a measure of vulnerability for a case study in Northern Sweden, and applied to the terms of importance and exposure.
Reliability and vulnerability are important elements in ensuring a smooth 24/7 operation of transportation networks, road networks in particular, and cost-benefit analyses of transportation projects should take this into account. One way of doing this is to say that investments in improved reliability constitute a cost and thereby saved disruption costs constitute a benefit.
A reliable transportation network represents a net benefit to society, and conversely, a vulnerable network represents a net cost to society. Hence, vulnerability ought to be an important parameter for decision-support in cost-benefit analyses, by seeking to establish a link between the terms reliability and vulnerability vis-à-vis costs and benefits.
Looking beyond the science of vulnerability assessments, this paper discusses some of the network attributes that influence the vulnerability of transport networks, influences that can be described as structure-related, nature-related or traffic-related attributes. The paper introduces vulnerability as a parameter for decision-support in cost-benefit analyses.
The paper outlines a framework for developing a methodology that to incorporate reliability and vulnerability as parameters for decision-support in a cost-benefit analysis. In doing so, this paper seeks to establish a link between the terms reliability/vulnerability and cost/benefit and seeks to describe reliability and vulnerability in terms of cost and benefit.
Transportation networks like freeways and interstate highways are the main backbone of modern society. Consequently, the reliability or vulnerability of any transportation network is thus a decisive factor not only in terms of market outreach and competition, but also in terms of continuity, to ensure a 24/7 operation of the community we live in.
