The NHTSA report notes that V2V devices are different from other technologies regulated by the NHTSA under Federal Motor Vehicle Safety Standards. Successful operation (in terms of safety benefits) requires ensuring that a V2V unit can communicate with all other V2V devices participating in the system.
This means auto manufacturers (and V2V device manufacturers), attempting to comply with a potential V2V mandate, could have "a significant testing obligation to guarantee interoperability" among their own devices and devices produced by other manufacturers.
No one knows whether individual companies can meet such an obligation themselves, or whether independent testing facilities might need to be developed. Based on the current security design, it's also likely that entities providing security management systems would require device manufacturers to comply with interoperability certification requirements to ensure the reliability of message content.
Next Page: Privacy and security issues