I had a CB and a radar detector back in the '70s, both very carefully set up. The Radar detector was hidden. Both of them saved me from some traffic tickets. Nowadays, I try to stay a tinch less than the prevailing traffic speed, for various reasons, tickets amongst them. Try to keep to the right.
While radar (and laser) detectors are available, I find it far less expensive, and far less nerve-wracking to drive at prevailing traffic speeds, as opposed to speeds far in excess of the same.
I understand that cell phones, mounted atop the dashboard, and working in conjunction with one's on-board radio, have features that will give the driver some sort of "look-ahead" provisions that are very useful.
FWIW, my last traffic stop was about a month ago--I was slightly over the speed of prevailing traffic; It happens. Once I told the Cop I was simply going to work, he ran my plates, and I went on my way without even a written warning. Of course, I employed The Plan when dealing with the Cop.