1977, only the charlie (highway) car had a light-bar, contra-rotating red and blue and they crossed in front of you, drove you crazy on a long trip at night! It was the only car less than a year old and the rest just had a single red gum machine on the roof. It was about the time I left in 1983 that we were getting light-bars and ditch lights and shotgun racks. One thing about it, those big boats were roomy back then!