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The vehicles form an ad-hoc network, meaning that there is
no pre-arranged network infrastructure and that the vehicles are
not required to have access to the public Internet for
communication. In addition, these vehicles are on mobility, so a
vehicular mobile ad-hoc network (VANET) is created. In
particular, VANETs that consist of vehicles as nodes, face
challenges that are far different than regular MANETs. These
challenges include high-speed mobility, constraints on where
vehicles can move because of roadways, unpredictable driver
behavior and variable traffic behavior[2].
Some proposed inter-vehicular communication systems
[4],[7] rely on the presence of static, outside infrastructure for
connectivity or event notification (e.g., fixed info-stations that
can monitor traffic and provide information to passing vehicles).
In contrast, the techniques we develop can be applied to any set
of vehicles that have a network device capable of sending and
receiving messages. Other work [1],[3],[6] has considered
passing information only through vehicles traveling in the same
direction, rather than taking advantage of traffic in oncoming
lanes.
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