That photo is extremely unique in its self, that is the California Highway Patrol with a bar I have never seen them use especially with a center mounted rotating light with a CLEAR lens. In 1968 they tested roof mounted lighting, however they stayed with the red spot but in 1970 for high traffic areas they once again tried over head bar similar to that in the photo. CHP only went with (4) PAR46, two forward and two rear facing. The two front lights, some had (2) red and several were trying the passenger side blue, the rear was (1) amber and (1) blue. Also, they did not ditch the red spotlight or the amber/red flashing lights in the rear. You can still see them in that picture hanging in the back window. These units were mainly assigned high traffic areas, LA and surrounding areas, San Diego, San Francisco and Sacramento. Shortly around 1972-73 they too went to the Federal TwinSonic CTS. which most CA. municipal and county agencies had switched over too. Cool Picture though.