TrafficMaster/Other motorway traffic cameras - SPEEDING?
Discussion
Hi all.
Was just having a discussion in the office (as we are very clearly quite busy) about these traffic cameras that are mounted on motorway bridges; in particular, if they can catch one speeding through them.
We concluded that there are probably two different scenarios; one where a vehicle is travelling a few mph over the limit, and then one where a vehicle is travelling several tens of mph over the limit (where someone watching the camera could clearly see a car blitzing down the road)
We didn't know the answer to either scenario, so we thought that we should take the question to pistonheads!
Was just having a discussion in the office (as we are very clearly quite busy) about these traffic cameras that are mounted on motorway bridges; in particular, if they can catch one speeding through them.
We concluded that there are probably two different scenarios; one where a vehicle is travelling a few mph over the limit, and then one where a vehicle is travelling several tens of mph over the limit (where someone watching the camera could clearly see a car blitzing down the road)
We didn't know the answer to either scenario, so we thought that we should take the question to pistonheads!
HantsRat said:
Cameras in blue boxes and usually TrafficMaster. Green boxes are highways agency. The police also have lots of ANPR cameras across the county on key routes. The police ones however record the full plate and information is stored for crime prevention and recording.
Ah fair enough. Can the green ones do people for speeding then? Or do you mean as in actual crime like drugs, terrorism, etc.?spitfire-ian said:
That's beggared the thread putting facts in 
I used to work with camera-derived data in London. Real-time feeds from various ANPR networks including TM. From memory the feed from TM was passed to us using one-way encoding, we passed back our camera data to them as part of a reciprocal agreement also one-way encoded.
This meant that the plate information was anonymous but could be used to calculate journey times and traffic patterns.
For internal use we only ever used the encoded plate info but did pass clear plate data to another party which was, again from memory, governed by an act of parliament and was only available for a defined single-purpose. Use outside of that remit was prohibited.
IIRC the TM data was encoded at source - i.e. in the camera and only the anonymous data was passed over the network along with time and camera ID and no image or encoding of the image. So, in theory you could track the distance/time to calculate the speed and also run every known plate through the encoding to find out the plate's hash and build a look-up but that's just not happening.
This meant that the plate information was anonymous but could be used to calculate journey times and traffic patterns.
For internal use we only ever used the encoded plate info but did pass clear plate data to another party which was, again from memory, governed by an act of parliament and was only available for a defined single-purpose. Use outside of that remit was prohibited.
IIRC the TM data was encoded at source - i.e. in the camera and only the anonymous data was passed over the network along with time and camera ID and no image or encoding of the image. So, in theory you could track the distance/time to calculate the speed and also run every known plate through the encoding to find out the plate's hash and build a look-up but that's just not happening.
IainT said:
I used to work with camera-derived data in London. Real-time feeds from various ANPR networks including TM. From memory the feed from TM was passed to us using one-way encoding, we passed back our camera data to them as part of a reciprocal agreement also one-way encoded.
This meant that the plate information was anonymous but could be used to calculate journey times and traffic patterns.
For internal use we only ever used the encoded plate info but did pass clear plate data to another party which was, again from memory, governed by an act of parliament and was only available for a defined single-purpose. Use outside of that remit was prohibited.
IIRC the TM data was encoded at source - i.e. in the camera and only the anonymous data was passed over the network along with time and camera ID and no image or encoding of the image. So, in theory you could track the distance/time to calculate the speed and also run every known plate through the encoding to find out the plate's hash and build a look-up but that's just not happening.
...And this is why I love this forum! Thanks guys!! This meant that the plate information was anonymous but could be used to calculate journey times and traffic patterns.
For internal use we only ever used the encoded plate info but did pass clear plate data to another party which was, again from memory, governed by an act of parliament and was only available for a defined single-purpose. Use outside of that remit was prohibited.
IIRC the TM data was encoded at source - i.e. in the camera and only the anonymous data was passed over the network along with time and camera ID and no image or encoding of the image. So, in theory you could track the distance/time to calculate the speed and also run every known plate through the encoding to find out the plate's hash and build a look-up but that's just not happening.
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