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This diagram
illustrates how the three V2I tracks fit together.
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Track 1, Enabling
Technologies – the enabling technology interacts with work to develop all
V2I applications, including Safety, Mobility, and the Environment. Some of the components of the V2I Reference
Implementation include an updated Signal Phase and Timing (SPaT) message set
with map and GPS correction signal.
Other potential firmware changes in a connected vehicle controller are
signal logic revisions that allow for a more interactive, adaptive signal
control that provides mobility and environmental benefits along with
information for vehicle-based safety applications.
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Track 2,
Application Selection, Development and Evaluation – Over the next two
years, four or five V2I Safety applications will be developed and field
tested. Formal cost:benefit analyses
(CBAs) will result in defining safety effectiveness data.
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Track 3,
Infrastructure Planning and Policy – Each agency will make independent
decisions regarding whether or not to invest in V2I systems, the extent of
any such deployment, and the manner in which investment and deployments are
made. There may or may not be business
models that support public-private partnerships, or that stimulate industry
support for data capture and management.
US DOT cannot define how V2I deployment will occur, but the intent is
to have a system of standards and specifications that permit participation in
the connected vehicle environment, within defined parameters and using
appropriate protocols to preserve the integrity of the data and
communications between entities. The
standards and specifications are also intended to be robust enough to insure
that systems remain backward and forward compatibility over an extended
period of time, to protect investments in infrastructure and vehicles.
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