Today I am presenting a paper from an old friend of mine. Well, “friend” is perhaps a slight exaggeration, as I have only met him a few times, but his work has nevertheless been a great inspiration to me over the years, since we work in the same field: transport network vulnerability. In 2006 Erik Jenelius from KTH in Stockholm, Sweden, together with Tom Petersen and Lars Göran Mattson published Importance and exposure in road network vulnerability analysis, where they introduce the concepts of link importance and site exposure. In the paper they calculate several indices for link importance and site exposure for the Swedish road network, based on the increase in generalized travel cost when links are closed.

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