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The LRMS is intended to provide a practical approach to standardization for location referencing within a mixed data set environment, i.e., where more than one kind of spatial data set exists, and where spatial references between these data sets must be made. Although some ITS applications in local areas may be satisfied by having one common data set— for which location references may be implemented in any number of ways— many ITS applications will have broad interoperability requirements within the nation or a region. For example, a vehicle driven from California to Florida in the U.S. should be able to receive and understand spatial references for traffic information or routing instructions throughout the trip. Similarly, information sent from a vehicle to a central site should be understood in any city regardless of the kinds of data sets in use, whether they are public or private, or how locations are referenced internally to particular data sets.

This SAE Information Report represents an information report on a conceptual ITS architecture and its accompanying protocols from the perspective of Advanced Traveller Information Systems providers and users. While a specific logical and physical architecture for ITS is still in the development stages, this conceptual architecture provides a robust general view of ITS functions and interfaces.

This SAE Information Report defines consistent terminology for Intelligent Transportation Systems (ITS). The list of defined terms is followed by a list of acronyms. Certain criteria were used in selecting terms for this document. Terms in widespread use in the ITS community covering significant services, technologies, and applications were chosen. This document focuses on terms used in the United States, although it covers aspects of worldwide ITS deployment. This document focuses on automotive applications, which include interfaces to and from the automobile. Later versions may include a wider scope. ITS includes a wide array of services, applications, and technologies. The Department of Transportation ITS National Program Plan divides ITS into 29 User Services, which are included in this glossary. The User Services range from Pre-Trip Travel Planning to Fully Automated Highway Systems.