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A method in communication between a vchicle ( 1) travelling: along a route (7 ) and a stationary system (2),the vehicle being equipped with a communication unit (3) which communicates messages to the stationary system (2). The method comprises dividing the route into a plurality of partial sections (8). defining tor each partial section a required intbrnution flow from the vehicle. and adapting the communication to this definition. The method makes it passible to command the communication unit always, to communication with conrreclly adjusted accuracy. This also improves the possibility of effectively utilising the traffic information in local units, for instance for displays and traffic signals