Device for real-time signalling of at least one object (13, 14, 15) to a navigation module of a vehicle comprising a first sensor arranged to produce first-sensor data comprising a first captured position and first captured speed of the object relative to the vehicle, comprising: - at least one second sensor (2, 3) arranged to produce second-sensor data comprising a second captured position and second captured speed of the object relative to the vehicle; - a synchronization module arranged to produce synchronized data comprising a first synchronized position from the first captured position and first captured speed and at least one second synchronized position from the second captured position and second captured speed; - a merging module arranged to produce merged data comprising a merged position from the first synchronized position and the second synchronized position in such a way as to signal said at least one object (13, 14, 15) to the navigation module by communicating all or some of the merged data thereto, characterized in that it comprises: - a risk evaluation module arranged to complete the merged data with a risk indicator associated with each signalled object (13, 14, 15) and generated from the merged data, - a set of blocks (133, 233, 333, 433) for computing a score from one or more merged data and a block for combining scores computed by some or all of the set of score computation blocks so as to generate the risk indicator of each object by combining scores, said set comprising a block for computing a score as regards the distance separating the object and the vehicle, a block for computing a score as regards the angle separating an axis of sight of the object and a longitudinal axis of the vehicle, a block for computing a score as regards the speed of movement of the object with respect to the vehicle and a block for computing a score as regards object type, with a view to attributing a vulnerability score depending on the type of object, the block for combining scores applying, to the scores generated by the block for computing distance score, the block for computing angle score, the block for computing speed score and the block for computing object-type score, a combination rule that depends on the intended use. - at least one second sensor (2, 3) arranged to produce second-sensor data comprising a second captured position and second captured speed of the object relative to the vehicle; - a synchronization module arranged to produce synchronized data comprising a first synchronized position from the first captured position and first captured speed and at least one second synchronized position from the second captured position and second captured speed; - a merging module arranged to produce merged data comprising a merged position from the first synchronized position and the second synchronized position in such a way as to signal said at least one object (13, 14, 15) to the navigation module by communicating all or some of the merged data thereto, characterized in that it comprises: - a risk evaluation module arranged to complete the merged data with a risk indicator associated with each signalled object (13, 14, 15) and generated from the merged data, - a set of blocks (133, 233, 333, 433) for computing a score from one or more merged data and a block for combining scores computed by some or all of the set of score computation blocks so as to generate the risk indicator of each object by combining scores, said set comprising a block for computing a score as regards the distance separating the object and the vehicle, a block for computing a score as regards the angle separating an axis of sight of the object and a longitudinal axis of the vehicle, a block for computing a score as regards the speed of movement of the object with respect to the vehicle and a block for computing a score as regards object type, with a view to attributing a vulnerability score depending on the type of object, the block for combining scores applying, to the scores generated by the block for computing distance score, the block for computing angle score, the block for computing speed score and the block for computing object-type score, a combination rule that depends on the intended use.