CVRIA Glossary

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Facility

A physical infrastructure element that supports the use of services and other resources. A Facility includes physical objects represented in the physical viewpoint; it may be one such object, or an aggregation of many of the same or different types.

Federal Highway Administration (FHWA)

An agency of the United States Department of Transportation. FHWA administers the Federal-aid Highway Program, which provides financial assistance to States to construct and improve highways, urban and rural roads, and bridges. FHWA also administers the Federal Lands Highway Program, which provides access to and within national forests, national parks, Indian Tribal lands, and other public lands. FHWA is headquartered in Washington, DC, with field offices across the country, including one in or near each State capital.

Federal Transit Administration (FTA)

An agency of the United States Department of Transportation. FTA is the principal source of Federal financial assistance to America's communities for the planning, development, and improvement of public or mass transportation systems. FTA provides leadership, technical assistance, and financial resources for safe, technologically advanced public transportation that enhances mobility and accessibility, improves the nation's communities and natural environment, and strengthens the national economy. FTA is headquartered in Washington, DC, with regional offices in Atlanta, Boston, Chicago, Dallas, Denver, Kansas City, New York, Philadelphia, San Francisco, and Seattle.

Federation

A group of domains that coordinate to share resources while each domain retains its authority over its own resources. Federations are governed by negotiated agreements.

Field

These are intelligent infrastructure distributed near or along the transportation network which perform surveillance (e.g. traffic detectors, cameras), traffic control (e.g. signal controllers), information provision (e.g. Dynamic Message Signs (DMS)) and local transaction (e.g., tolling, parking) functions. Typically, their operation is governed by transportation management functions running in back offices. Field also includes RSE and other non-DSRC wireless communications infrastructure that provides communications between Mobile elements and fixed infrastructure.

Field Objects

Intelligent infrastructure distributed along the transportation network which performs surveillance, information provision, and plan execution control functions and whose operation is governed by center physical objects. Field systems/devices also directly interface to vehicle or mobile physical objects. The Field class is one of the four general classes of physical objects defined in the Connected Vehicle Reference Implementation Architecture, typically shown in orange on the application drawings.

Flexibility

The ability to adjust or adapt to external changes with little or no design changes.

Flexibility

The ability to adjust or adapt to external changes with little or no design changes.

Flow Characteristics

Characteristics that govern the transmission and receipt of information flows within CVRIA. Coordination relationships from the Enterprise View may imply Flow Characteristics:
a) An expectation of guaranteed delivery drives no-repudiation of receipt.
b) An expectation of information provision may drive regularity and periodicity.
c) An expectation of personal information exchange drives a high confidentiality requirement.

The context of Physical Objects may also imply certain Flow Characteristics:
a) Information flows between two mobile objects (vehicle or personal) are always restricted to wireless media.
b) Communications involving one mobile object and one fixed object involve wireless media, but may also include fixed media backhaul.
c) Communications between two vehicles nearly always use 5.9 GHz DSRC and the IEEE 1609.x stack.

Forwarding

The process of forward sending data onto another entity (system user) without modifying or storing the data for any substantial length of time.The process of forward sending data onto another entity (system user) without modifying or storing the data for any substantial length of time.

Functional Object

An abstract model of a functional entity that receives requests, performs actions, and generates or processes data. See Process Specification.

Functional Requirement

A statement that specifies WHAT a system must do. The statement should use formal "shall" language and specify a function in terms that the stakeholders, particularly the system implementers, will understand. In the Connected Vehicle Reference Implementation Architecture, functional requirements have been defined for each application based on concepts of operations and other source documents that drove the development of CVRIA.

Functional View

The part of the Connected Vehicle Reference Implementation Architecture that defines what has to be done to support the connected vehicle applications. It defines the processes that perform connected vehicle functions and the information or data flows that are shared between these processes. The functional view was developed using Structured Analysis techniques to support and provide the detail for the physical view's physical objects and information flows.

Functionality

The capabilities of the various computational, user interfaces, input, output, data management, and other features provided by a product.