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This SAE Information Report describes a reference model for an in-vehicle data bus for Intelligent Transportation Systems (ITS). It introduces the ITS Data Bus (IDB) reference model and describes overall IDB concepts.

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.