I can understand your frustration. 2 km over speed? Humans do not have the senses enough to make that fine judgement unless you are constantly looking at your speedometer while driving, which is dangerous.
I remember once getting a ticket while driving through Hope city center on the way back from fishing, among a long line of cars and my sporty RX7 was stuck some where in the middle. When I just got on Route 1, an officer pulled up and gave me a ticket for speeding while driving through Hope. I was pretty sure I wasn't speeding and how was it he picked me out of the long line of slow moving cars driving through Hope city center? He had no scope of my speed. When I asked him where he scoped me, he said he was driving through the town on the opposite lane. How could he prove to the court that he could get an accurate reading this way and considering I was stuck among a few cars, it was incredible that he could pick me up as speeding and not others. It seemed to me a ticket given out based on the look of my flashy sporty car and perhaps he was looking for filling quota.
Anyway, the court day was in Hope, and I was a computer consultant. I don't need a computer to calculate the cost & benefit of disputing the ticket on its appointed weekday in Hope. The distance made it 'hopeless' and economically pointless to fight it. So I paid it. Should have checked into the possibility of requesting the court case to be relocated to Coquitlam or Vancouver instead. Can you make such a request?