First hello to everyone, am new here, therefore I have no idea whether I have sorted my request thematically correctly. But now directly to the matter. I have now extensively informed myself on the Internet and found out a lot about all-round lights and front flashes. Blue light and yellow light fall away anyway, red light and green light seem to be generally forbidden in DE and with white light unfortunately I found no unambiguous information. Now my question is: Would theoretically be a cyan colored or turquoise front flasher + all-round light legal? In fact, this is neither blue, nor green, as these are their own shades and therefore do not have to be registered or regulated by law, right? I’m not interested in spending myself as an emergency vehicle or something like that on this point either. I just want to be able to point out to other road users that something might not be right. Both behind me driving vehicles and vehicles in front of me. I have it in front of me. d, after I am a frequent driver, unfortunately more than often enough experienced that enormous danger situations of all kinds have arisen, which were partly in their intensity so enormous that a simple brake/warning light was not sufficient as a hint. These only in the rarest cases traffic jams, but nevertheless sudden accidents, which happen directly before or behind you. Likewise, people who are of the opinion to drive on the highway in front of you, one to 20 km/h slow down To have n and then make it impossible for you to overtake them, because at home they are probably constantly only finished by the woman, have nothing to say or maybe are simply completely alone, what do I know what these beings see as a “justified reason”. Anyway, there have been such situations several times on the route that I drive, and just at night (wedding of such minor mediated) a cyan-colored or turquoise light could warn the traffic behind me and at the same time scare the serious traffic danger in front of me and thus lead to the ending of the serious danger situation. Likewise, especially for such cases, it would be good to know whether auditory signals are generally forbidden, or whether this depends on sound, melody or completely different points, also mentioned points, if present, would be good to know. Thank you in advance for the answers! Lg, Kirschi