Intelligent Transportation System, ITS, service station , comprising: a receiver having an area of radio coverage and being configured to receive a first Collective Perception Message, CPM, from a first ITS station at a first position (P B ) within the coverage area , the first CPM including first sensor data (sd i ) on an object perceived by the first ITS station ; an aggregator connected to the receiver and configured to aggregate said first sensor data (sd i ) with at least one second sensor data (sd i ) on the same object into a third sensor data (sd Σ ), which second sensor data (sd i ) is either received via the receiver in a second CPM from a second ITS station at a second position (P C ) within the coverage area perceiving the same object or is determined by a sensor of the ITS service station perceiving the same object ; wherein the first sensor data (sd i ) includes a first data value (d i ), the at least one second sensor data (sd k ) includes a second data value (d k ) and the aggregator is configured to calculate a third data value (d Σ ) from said first and at least one second data values (d i , d k ) and to include said third data value (d Σ ) in the third sensor data (sd Σ ), wherein each of the first, second and third data values (d i , d k , d Σ ) is a distance of the object with respect to a respective sensor , a speed of the object , an acceleration of the object , a geo-referenced or map-matched position (P D ) of the object , a heading, angle or path of travel of the object , one or more dimensions of the object , a shape, color or class of the object , and in that the ITS service station further comprises a transmitter connected to the aggregator and configured to broadcast said third sensor data (sd Σ ) in a third CPM . a receiver having an area of radio coverage and being configured to receive a first Collective Perception Message, CPM, from a first ITS station at a first position (P B ) within the coverage area , the first CPM including first sensor data (sd i ) on an object perceived by the first ITS station ; an aggregator connected to the receiver and configured to aggregate said first sensor data (sd i ) with at least one second sensor data (sd i ) on the same object into a third sensor data (sd Σ ), which second sensor data (sd i ) is either received via the receiver in a second CPM from a second ITS station at a second position (P C ) within the coverage area perceiving the same object or is determined by a sensor of the ITS service station perceiving the same object ; wherein the first sensor data (sd i ) includes a first data value (d i ), the at least one second sensor data (sd k ) includes a second data value (d k ) and the aggregator is configured to calculate a third data value (d Σ ) from said first and at least one second data values (d i , d k ) and to include said third data value (d Σ ) in the third sensor data (sd Σ ), wherein each of the first, second and third data values (d i , d k , d Σ ) is a distance of the object with respect to a respective sensor , a speed of the object , an acceleration of the object , a geo-referenced or map-matched position (P D ) of the object , a heading, angle or path of travel of the object , one or more dimensions of the object , a shape, color or class of the object , and in that the ITS service station further comprises a transmitter connected to the aggregator and configured to broadcast said third sensor data (sd Σ ) in a third CPM . <EOS>