We all at some time or the other may have experienced the following situation: you are held at a traffic light, listening to the radio and all of a sudden there is an ambulance with sounding siren and flashing lights behind you. You panic and try to find a way to make space and let it pass as soon as possible. Would it not be much better and specifically much safer if a warning could appear inside your vehicle long before the arrival of the emergency service vehicle? Target Blu Eye is such a warning device.