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Let's assume that 25% can't - that means incorrect or false speeding tickets 25% of the time. Should we be happy with that?

If an officer's estimates are that inaccurate, then he will lose cases in court and stop getting any convictions. Those officers soon find it difficult to find work.

If you provide multiple witnesses who testify that the GPS receiver on your dashboard indicated a speed significantly lower than the officer's estimate, or some other strong evidence, then you could beat the officer's testimony.

The point is that a trained officer will likely have a documented accuracy for his estimates. That's going to stand up in court unless you contradict him with something stronger.

If an officer's estimates are that inaccurate, then he will lose cases in court and stop getting any convictions. Those officers soon find it difficult to find work.

How do you prove that the officers' estimates are incorrect? Having GPS capable of calculating your speed and producing documentation would pretty much be the only way, right? How many people have that in their cars right now? For those that don't, if the nice officer says you were going 45 in a 35 zone, and you know you were only going, say, 39, how do you prove him wrong in court? From what I've seen, when it is Joe Citizen vs. cop in traffic court, cop wins EVERY time.