And I got out of what would have been a very expensive ticket. It was one of the few times I ever got to use my engineering degree.
The only reason I was able to prevail (without getting into details) is I had witnesses in several other cars at the intersection that gave me the necessary "data points", under oath, that I needed to plug in the equations.
I won't say that the judge actually understood the math I presented, because I'm sure he didn't, but I was able to demonstrate why the officer's statements couldn't be accurate. That was good enough to get off in this particular case.
I caught the cop in an obvious lie using his own testimony- he completely contradicted himself and said he pursued me while going 65 mph until he caught me, but said I was going 85 mph. Exactly how does that work?
I was actually going the speed limit of 55 because I saw him from the very beginning, and this was a well-known trap area, but I was on a bike and cops hate bikes.
Despite making his testimony look like the lie that it was, I still got the ticket. Then the cop cornered me in the hallway and said if I ever set foot in his town again he'd arrest me on sight! Hey, officer, if you don't want to sound stupid in court, keep your mouth shut next time. Otherwise, I can't help you.