Over the years, I have seen only a few of these hilarious cops that raise their arms when you apply the brakes on the car. They are quite rare, and I finally gave up looking for one, and decided to make my own, from scratch. My wife blew up a photo of one to full size, and I carefully cut the image out, and temporarily contact cemented it to a piece of sheet metal and cut the sheet metal away from the image.
I since our 1922 coupe is now 12 volt, I used a 12v solenoid for electric door locks of a modern car, to active the arms. Once I got the arms mounted, and figured out the linkage from the solenoid to the arms, and then just for fun, I added to tiny LED lights installed in the cop's gloved hands, in place of the tiny "STOP" signs the original had. I also used a 12v 25 amp electronic flasher in the circuit to the cop, so he would continuously raise and lower his arms when in operation.
I cleaned off the paper image, and gave it to my artist wife, who free hand painted the image on the metal. She did a wonderful job, and here is the results, mounted on our coupe.
So far, all the kids love it, and all the adults laugh when they see it. I now have the ultimate 3rd brake light..
