I got pulled over for speeding three times so far. One time, I was speeding on purpose, because of my emotional state. I fully deserved the ticket, so I just paid it, IIRC. It wasn't cheap.
The other two times, I got warnings. One was for doing 42 in a 30mph zone (which isn't really posted), and the other time, I was doing 80mph on a 65 highway. In fact, I didn't quite notice how fast I was going downhill, and when I noticed, I told my friend, "hey, look at that, I'm doing 80". Well, around the next bend there was a cop on the median, and he pulled me over. How I got away with only a warning, God only knows.
I generally don't speed "excessively". Maybe 3-5 over in the city, or 5 over highway. But some areas I don't speed at all, as they are known speed traps. Sometimes I drive under the speed limit, especially if it's dark and rainy and I can't see the road all that well.
I also don't slow down unneccesarily in the snow, I try to keep some momentum.