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This paper presents the following VAN concept led by a vehicle analysis: electrical architecture must not be basically changed in order to be cost effective; efficiency, interoperability and safety aspects must be rigorously respected to avoid lack of quality. As a consequence VAN solutions meet the requirement set concerning wiring, transceivers, protocol controllers and software services. Each of these solutions is optimized to assure safety and easy use. VAN transceivers support multiplexed applications - even high speed application - with conventional wiring. VAN controllers offer a large diversity of services, so allow the minimization of network load, of CPU load, with a high Real Time efficiency. Moreover their structure is very open to diagnosis requirements. VAN softwares provide simple, reliable, reusable mechanisms of sharing, exchange and synchronization. Such mechanisms minimize cost development and guarantee safety proofs in the liability context.