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produce social consequences (Graham & Marvin, 2002; Klinenberg, 2015). Deteriorating
infrastructure systems and lack of maintenance have left communities in the U.S. more susceptible
to risk and hazards (Little, 2004a; Flynn & Burke, 2011). Furthermore, the increasing complexity
and interconnectedness of infrastructure systems increases risk of failure (Little, 2004b; Flynn &
Burke, 2011).
In disasters, many of the impacts experienced by communities comprise direct impacts of
failed infrastructural systems (e.g., disruptions in electricity, cellular communications, or
transportation) and indirect impacts, such as the disruption of social and institutional support
systems. Many people are not well-served by these systems in normal, “blue skies” circumstances,
and existing social inequities are highlighted and exacerbated during times of disaster, leading to
inequitable outcomes for the most socially vulnerable (Klinenberg, 2015). This is not to downplay
the extraordinary ways in which communities can come together during a disaster, as described in
Rebecca Solnit’s book, A Paradise Built in Hell (2010); rather, it is to recognize that physical and
technological infrastructure play an important, but often invisible, role in the structure of social
support systems that reinforce everyday community life.
The effects of a disaster can be understood as departures from the “normal” social patterns
of daily life manifested at multiple scales (Chen et al., 2013). At the scale of the community,
emergency response activities become urgent and paramount; at the household level, a new set of
needs, perhaps ensuring the safety of loved ones and procuring basic necessities, replace the set of
“everyday” needs that were previously important (Ibid). Thus, access to transportation services
and the range of people’s daily needs will both change significantly in the case of a disaster, leading
to a new set of conditions under which a community must function by leveraging and matching
locally available resources.
Many people use transportation services on a daily basis to help them accomplish a range
of necessary activities. Transportation services enable people to travel to get to work, to get to
school, to run errands or do shopping, to access services such as day care or health care, and to
participate in recreational or leisure activities. Many transportation activities are organized or
facilitated by information and communications technologies (ICTs), which also enable the
communication necessary to complete a range of tasks, from the transportation-related items noted
above to carrying out work-related tasks to accessing social support.
Although there are many options for combining or substituting transportation and
communications technologies (Salomon, 1986; Mokhtarian, 1990; Lyons, 2009), both often rely
on infrastructure that is susceptible to systemwide failure in the event of a disruption, such as
cellular or transportation networks. In addition, access to many of the transportation services that
facilitate daily activities relies upon the provision of private services and participation in digital
society. In a relatively contained emergency situation that limits transportation options but not
communication services (such as a transit strike, flood, or large planned events) the substitution of
travel by ICT becomes much more attractive, and ICT can accommodate many work, commerce
and social functions if needed (Mokhtarian, 2009). However, the range of scenarios for
transportation and communication technology use and substitution would likely change
significantly in the case of a larger disruption. In the next section, we discuss specifically the
effects of disasters on transportation systems.
Transportation networks and disasters
A functional and resilient transportation infrastructure is necessary for supporting the everyday
needs of society. Disruptions such as disasters, which are uncertain and often unpredictable, can