Road vehicle comprising: two or more ports (2, 3) on the same side of the vehicle; a sensor device comprising one or more sensors (13, 15, 16, 17, 19), the sensor device being configured to detect for each port (2, 3) individually a non-finished or imminent opening event of the respective port (2, 3), the sensor device being further configured to output sensor signals representing the result of the detecting; a signaling device comprising at least one optical transducer for emitting optical light signals; a controller configured to control the signaling device as a function of the sensor signals to cause the at least one transducer to emit a respective light signal for each of the ports (2, 3) for which a detected non-finished or imminent opening event is represented by the sensor signals such that each light signal is individually assigned to the respective port (2, 3); wherein the controller is further configured to determine for each detected non-finished or imminent opening event, based on the sensor signals, a probability of an actual occurrence of such opening event and to modify the optical light signal for such port (2, 3) as a function of the determined probability, wherein the controller is further configured to repeatedly determine for each detected non-finished or imminent opening event a probability of an actual occurrence of such opening event, characterized in that the controller is further configured to determine a rate of change of the probability over time as a function of these determined probabilities, and to modify the optical light signal according to the determined rate of change of the probability. two or more ports (2, 3) on the same side of the vehicle; a sensor device comprising one or more sensors (13, 15, 16, 17, 19), the sensor device being configured to detect for each port (2, 3) individually a non-finished or imminent opening event of the respective port (2, 3), the sensor device being further configured to output sensor signals representing the result of the detecting; a signaling device comprising at least one optical transducer for emitting optical light signals; a controller configured to control the signaling device as a function of the sensor signals to cause the at least one transducer to emit a respective light signal for each of the ports (2, 3) for which a detected non-finished or imminent opening event is represented by the sensor signals such that each light signal is individually assigned to the respective port (2, 3); wherein the controller is further configured to determine for each detected non-finished or imminent opening event, based on the sensor signals, a probability of an actual occurrence of such opening event and to modify the optical light signal for such port (2, 3) as a function of the determined probability, wherein the controller is further configured to repeatedly determine for each detected non-finished or imminent opening event a probability of an actual occurrence of such opening event, characterized in that the controller is further configured to determine a rate of change of the probability over time as a function of these determined probabilities, and to modify the optical light signal according to the determined rate of change of the probability.