despite the gobbledegook that shoichiro was going on about, he did make one valid point. for 73km/h, you'd have travelled 14 meters. for you to bring an arbitrary number like 10 to validate your case is a weak approach. you could have easily travelled 14 meters there.
secondly, your speed is taken by the inductive loops, not by the cameras. they take two pics for every violation, so it's not to say that you were going 73 in the pics, it means you crossed the loops at 73. the first photo triggered with you just passing the loops, and the 2nd .7 seconds later. it's hard to tell if your brake light is on or not, but it could have been that you were slowing down as you hit the loops, so the speed traveled over the loops will exceed the one you have inferred from the photos.
but you are still making arbitrary claims at the moment.
the loops are a calibrated instrument, estimating distance by a picture certainly can't be considered a more reliable method.
Wibbly, I did state that I have to go back to the intersection to do a measurement. My estimate was based on the best I can do with two pictures given to me. It is nothing more than what I said in my original post.
I also do not think my estimate is unrealistic, how long do you think the red Mitsubishi next to me is? Now visualise 3 of them bumper to bumper across the intersection? I estimate 3 of them at 3 metres each is enough to fill the intersection.
I am aware of how our speed camera system works, it's the exact system for our toll roads, and the same for triggering traffic lights when stopped and waiting for it to turn green. Yes, they are inductive loops.
Nowhere did I state estimating distance by pictures is a more reliable method. These pictures are supposed evidence of me speeding, what would be the point of sending pictures if they aren't proof? Neither of the pictures show me braking, so if they don't show me braking then you can't hypothesise that I was braking before I hit the loops. In fact I'm almost certain by looking at these picture that I'm not in fact braking. The tail light is only marginally brighter than my red reflector, I think it's just simply turned ON like all motorcycle tail lights are when the key is turned, that's it. It would become even brighter if I applied the brakes.
Speed camera fines here are sometimes overturned, in fact, in some cases, hundreds of fines or thousands are overturned simultaneously due to calibration errors or other problems resulting in incorrectly fined motorists.
If you look in the pics you can see how its done.
They cut a square slot in the pavement and install the loop, then have a slot that runs back to the control box to carry the signal wiring. The squares you see aren't floating at all, the slots aren't very deep. Once it is all installed they seal up the slots with what appears to be some sort of epoxy caulking.
The loops are a specified distance apart, so they measure the time between pulses to calculate a speed. The type of vehicle hitting the loop is irrelevant because any lag in generating a pulse will be the same for both loops.
I'd also like to point a few other reasons why I don't believe I was speeding. This is a few minutes from where I live. I'm aware of this camera, it has been here for more than 6 months. I travel this road everyday.
No reason for me to lie here, as it wouldn't achieve anything. I was legitimately surprised when I got this fine, I also cannot recall this incident. If I felt I was speeding and thought I got pinged, I would remember it.
Finally, take a look at that first picture, notice how you can see the definition of the hubcaps of the red Mitsubishi? Now look at the SUV stopped in the middle of the intersection on the oncoming lanes, can you see the definition of his rims/hubcaps? What does that tell you? It tells me that the red Mitsubishi was travelling extremely slowly. Which would mean that I was no where near 73km/h.
I think those lights at the intersection were red just moments before those pictures were taken, I would have been behind those cars and as it turned green I accelerated quicker than them covering more ground, that is not evidence of me exceeding the limit. Finally, here's another unlikely reason
That is the intersection in question, the traffic heading that direction has to make a 90 degree turn and as a result are generally quite slow leaving that intersection as there's often stopped traffic already waiting. I don't know what the scenario was, but that's just my guess having driven that road for the last 9 years. Google image distances aren't accurate, but I'd say that 10m mark is fairly close to my estimate earlier. I was well within 10m.
Now, I had no intention of making this a court case in the forums as this does nothing to help me, but I think if I did go to a court, the judge could ask me the same as you did, so it may help that I'm prepared to answer them accordingly.