Gatso pictures show that car WASN'T speeding

Your method of calculation on the images is wrong. You're lining up the numberplate at the back with a road line that's beyond the front of the car.

To me it looks like her rear wheel is half way between 4 and 5 in the first pic and past 9 on the second.

That's pretty much 5 lines = 35mph.

its the clearest part to compare, as long as he uses the number plate in both pictures then it is ok to use that to count how many lines were crossed.
 
Count the number of lines behind the wheels in the first picture, do the same for the second picture and take first from the second for a rough number of lines she has passed.

Those pictures are not brilliant but from what I can make out she is just past number 4 in the first picture and between 8 and 9 in the second picture - making it a VERY close call.

Any way you can do an over head shot of the pics or scan them in so we can see clearer and give a better opinion?
 
Is it just me, or are these photos dated 03/11/09? Which would make this past the 14 days of conviction?

We haven't said who was driving the car yet - we asked for the pictures to help identify who was driving. We had 28 days from the date we originally received the notice which was about 13/11. She is going to send back and say she was driving which will give us another 28 days after they send the next bit of paperwork out.

I will attempt to beg/borrow/steal a scanner and get better images to post here and on PePiPoo.

In terms of correcting the parallax error and getting accurate results, what is the best way of doing this? I was considering drawing down vertically from the number plate to the road but it was just as difficult to work out where the line would touch the road - it's hard to draw in 3d on such crap quality 2d pics. I wonder how the police do it...

I was considering using similar triangles with the number plate as two of the known sides + the distance from the first mark to work it out but I suspect it still won't be completely accurate.
 
Saying "you don't know who was driving" won't help. Both the owner of the car AND the person driving are then liable for prosecution if you do not tell them who was driving.

Although I personally have avoided points using this method and that was with Mr SafetyPartnership aiming his gun right at the front of my car

These cameras are not the "highly tuned, OMG calibrated" devices people think they are. They are susceptible to their environment and there have been a few cases where clever people have sucessfully prooved the cameras were wrong.
 
If I was going to dispute something like this, I wouldn't post it on a public forum, saying that your mum was at fault...
 
Saying "you don't know who was driving" won't help. Both the owner of the car AND the person driving are then liable for prosecution if you do not tell them who was driving.

We don't intend to say we don't know who was driving, we have simply asked for the photos so that we can verify who was driving - if there were L plates on the car it would have been my sister, as there are not it must be my mother. Now that we know who was driving we are going to return the signed NIP.

If I was going to dispute something like this, I wouldn't post it on a public forum, saying that your mum was at fault...

I haven't said she was at fault; she believes she was doing less than 30 (it is a road she uses at least twice every day so it's not like she didn't know the camera was there!) and from the crap quality pictures and my flawed method I can come up with both 27 (manual with a ruler) and 35 (as posted.) I still don't know what is right. I'm going to try and get better scans and see if someone on PePiPoo knows of a better method of calculating the speed from the pictures than "roughly x marks passed".

Is this another case of someone trying to dodge a ticket? :rolleyes:

No. The main reason we are trying to prove she wasn't speeding is because she believes she wasn't speeding and just paying out a fine for something you don't believe you have done leaves a certain sour taste in the mouth.
 
The lines are only a secondary check anyway and can be within +/- 10% error, assuming they're even there in the first place (they're not mandatory).
 
In terms of correcting the parallax error and getting accurate results, what is the best way of doing this? I was considering drawing down vertically from the number plate to the road but it was just as difficult to work out where the line would touch the road - it's hard to draw in 3d on such crap quality 2d pics. I wonder how the police do it...

dont use the number plate at all, use the point of contact of the rear wheels.
 
Saying "you don't know who was driving" won't help. Both the owner of the car AND the person driving are then liable for prosecution if you do not tell them who was driving.

Well no, thats not quite true, if you don't tell them who is driving they cannot prosecute the driver but will of course prosecute the registered keeper under S172 unless they can prove, in court, that they took all reasonable steps to identify the driver.
 
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I count that as a little less than 4.5.
 
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