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ISO/TS 16951:2004 provides formal procedures and two alternative methods for determining the priority of on-board messages presented to drivers of road vehicles by transport information and control systems (TICS), and other systems. It is applicable to the whole range of TICS in-vehicle messages, including traveller information, navigation, travel and traffic advisories, "yellow pages" information, warnings, systems status, emergency calling system information, and electronic toll/fee collection, as well as to messages from non-TICS sources such as telephone, warnings and telltales.