A lot of people are saying "if you slow down when someone flashes lights to warn you, it works the same as a ticket." I doubt it. If you think you know where the cops are, you'll just speed up again as soon as you're around the next bend in the road.
Most of the people on this forum are responsible and intelligent, and know when and where it's possible to open the throttle a little without putting other people in danger. Think back to how you were at age 16, or better yet, how I was at age 16 when I got four tickets before I figured out that I wasn't Senna.
That being said, I've been a cop for three years now, and I've written one speeding ticket. I somehow manage to always be busy when the radar class comes up.