I absolutely L-O-V-E doing things like that. I once got a speeding ticket. Long story short, I was speeding up to swap lanes in front of an 18-wheeler because there was debris in my lane. Got a ticket.
I showed up in court with pics of the debris (went back after getting the ticket and took pics), measurements of distances, photos of the scene, top-down diagrams of play-by-play events, and detailed specs about acceleration and other car facts. Oh, and my professional racing competition license (signifying that I was certified to make split-second decisions about which actions to take when presented with a certain set of circumstances in a car).
The judge looked at all my stuff, then asked the Asst. DA, "Well, do you really feel like losing a traffic case today?" The ticket was thrown out.
Another time I got one, and I was able to prove that the cop could not have seen me from where he was sitting to where he said the violation occured (trees in the way - like that scene in My Cousin Vinny).
If y'all haven't guessed, I live for the arguement.