CVRIA Glossary

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Valid

When data values within a message are acceptable and logical (e.g., numbers fall within a range, numeric data are all digits).

Validate

To establish or confirm the correctness of the structure, format and/or contents of a data object.

Vehicle - Vehicle Communications

Dedicated wireless system handling high data rate, low latency, low probability of error, line of sight communications between vehicles. Advanced vehicle services, including the V2V Safety applications in the Connected Vehicle Reference Implementation Architecture (CVRIA) will use this link to support advanced collision avoidance implementations, road condition information sharing, and active coordination to advanced control systems. One of the types of architecture interconnects defined in the CVRIA.

Vehicle Bus

Vehicle Bus or Databus - A specialized internal communications network that interconnects components within a vehicle. A commonly used protocol on the vehicle bus is the Controller Area Network (CAN). CAN (or CAN-bus) is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer.

Vehicle Miles Traveled (VMT)

Miles traveled by all vehicles on a roadway.

Vehicle Physical Objects

Covers the connected vehicle related elements onboard vehicles. Vehicle physical objects include general driver information and safety systems applicable to all vehicle types. Four fleet vehicle objects (Transit, Emergency, Commercial and Maintenance and Construction Vehicles) add connected capabilities unique to these special vehicle types. The Vehicle physical object class is one of four general classes defined in the Connected Vehicle Reference Implementation Architecture.

View

A View is a representation of the system from the perspective of a related set of concerns, which is realized through as diagram and text as part of a Model. Architecture views are representations of the overall architecture that are meaningful to one or more stakeholders in the system. They enable the architecture to be communicated to and understood by the stakeholders, so they can verify that the system will address their concerns. Views are themselves modular and well-formed; each View is intended to correspond to exactly one Viewpoint and is constructed using the rules defined by that Viewpoint Specification.

Viewpoint Specification

The CVRIA is described from multiple Viewpoints, each focusing on different concerns associated with the system. A Viewpoint Specification is a specification of the rules and structure required to focus on particular concerns within a system. Each Viewpoint Specification includes a template from which to develop a corresponding View.

Volume-to-Capacity Ratio (V/C)

Ratio of the volume using a transportation facility to the capacity of that facility.