Abstract: The invention relates to signalling, particularly road signalling, means. A considerable variety of illuminated and reflective signalling means are known to give advice to the driver of a particular vehicle and of great value to the driver of a vehicle during the hours of darkness on unlit roads or in inclement weather where mist and fog shroud a road. Such known signalling means cannot satisfy the important need to give advice to a driver of a vehicle of the presence of another vehicle closely ahead, and which is of particular importance in misty or foggy conditions.