National ITS Architecture Glossary

Vehicle - Vehicle Communications

Dedicated wireless system handling high data rate, low probability of error, line of sight communications between vehicles. Advanced vehicle services may use this link in the future 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 National ITS Architecture.

Vehicle Miles Traveled (VMT)

Miles traveled by all vehicles on a roadway.

Vehicle Subsystems

Covers ITS related elements on vehicle platforms. Vehicle subsystems include general driver information and safety systems applicable to all vehicle types. Four fleet vehicle subsystems (Transit, Emergency, Commercial and Maintenance and Construction Vehicles) add ITS capabilities unique to these special vehicle types. The Vehicle subsystems class is one of four general subsystem classes defined in the National ITS Architecture.

From the main menu, select "Architecture", then "Physical Architecture" on the sub-menu, on the Physical Architecture page, select the "Physical Entities" for access to the Vehicle Subsystems. View the Physical Entities Page

Vision Statement

A document of the National Architecture that is written in "magazine style", the Vision Statement sketches a number of possible scenarios of ITS development over the next 20 years. It describes how travelers and system operators may be able to use and benefit from ITS technologies in their day.

From the main menu, select "Architecture Products", then "Documents" on the sub-menu for access to this document. View the Document View Page

Volume-to-Capacity Ratio (V/C)

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