This Technical Specification definesThe specific interfaces and functionality of traffic telematics (TT) services based onThe use of cellular networks. Device manufacturers are enabled to develop terminal equipment compatible to services based onThis standard.This will allow for interoperability of different terminal equipment and service providers which allows competition between service providers and terminal manufacturers. Furthermore it setsThe scene for international availability of these services.This Technical Specification specifies · TT-specific interfaces between terminal and service centre.This especially incorporatesThe message sets of the application data protocols andThe service-independent communication handling (including conditional access and transport protocols). · Functionality, procedures and requirements of basic terminal components as well asTheir interaction withThe service centre.This especially comprises conditional access and security mechanisms. · Service Specifications, which are essential to ensure consistent behaviour of terminal and service centre.The services incorporated withinThis issue comprise: · breakdown and emergency services · interactive traffic information services · broadcast traffic information services · navigation services (route assistance, route advice, homing) · operator services · general information services · floating car data collection It is envisaged that future research and development will lead to improvements onThe services listed above as well as toThe creation of new services. NeverthelessThis Technical Specification providesThe framework for seamless integration of new features and services intoThe existing architecture.