You just gave away your age. For people of a certain age the image of Broderick Crawford on his police car radio giving a terse 10-4 to the person on the other end will remain indelibly etched in their minds. I don't know if Crawford would care that's how most people who watched the show would remember him, but that's the way it goes. 10-4.
p.s. Lately I've watched reruns of the show on a cable network, and I'm amazed at how fast Crawford's character spoke. Also, when they described cars, they never gave the make of a vehicle. It was always a "tan sedan" or whatever.
No free ads for the automakers!