Mobile Camera Speeding Offence "Rolling Footage"

onomatopoeia99

If the OP were so minded, they could collect comparative data of their own on the dashcam and tracking device along a measured stretch of road driving at a constant indicated 29mph and back calculate the actual speed, so they can determine if their dashcam and tracking device are accurate.

A proper court would accept that an "expert witness" is not required to measure a distance (a tape measure will do, one does not need to be an expert to operate a tape measure) or operate a stopwatch to measure an elapsed time travelling over the measured distance at a constant speed, nor to do a simple sum with those two pieces of information to calculate a velocity. One can calculate the accuracy of a device that measures speed very easily if prepared to spend a couple of hours ensuring you have a 1/4 mile measured up and do some drive by tests at the same constant speed the device previously measured with the aid of a friend.

One benefit of doing that, is the OP would find out if his devices are accurate and that could inform his decision about whether to have his day in court or not.

Manxman_in_exile

AsaBlade wrote: »

Thanks for all the input people; it is much appreciated.

As I have mentioned, if I am guilty of the alleged offence then I have no problem with taking it on the chin and paying the £100 and doing the course. However, as discussed, my recollection - coupled with the evidence I have and that they have supplied - suggest to me that I didn't commit the offence.

As I said, I spoke with the Camera Partnership yesterday (Tuesday) and they have said they will send out the evidence upon what they will be relying upon if it went to court. They said it should be with me by Thursday or Friday so I will update you once I have received this.

Thanks once again for your input; much appreciated.

May I ask if you've received anything to update us with yet? I thought you had to plead not guilty in order to see the evidence they would rely on in court.

wgl2014

onomatopoeia99 wrote: »

If the OP were so minded, they could collect comparative data of their own on the dashcam and tracking device along a measured stretch of road driving at a constant indicated 29mph and back calculate the actual speed, so they can determine if their dashcam and tracking device are accurate.

A proper court would accept that an "expert witness" is not required to measure a distance (a tape measure will do, one does not need to be an expert to operate a tape measure) or operate a stopwatch to measure an elapsed time travelling over the measured distance at a constant speed, nor to do a simple sum with those two pieces of information to calculate a velocity. One can calculate the accuracy of a device that measures speed very easily if prepared to spend a couple of hours ensuring you have a 1/4 mile measured up and do some drive by tests at the same constant speed the device previously measured with the aid of a friend.

One benefit of doing that, is the OP would find out if his devices are accurate and that could inform his decision about whether to have his day in court or not.

For personal amusement or whatever that's fine, for court though it would be useless. The issue is not that the OP would need an expert witness but that if the accuracy of the measuring equipment is questioned the prosecution would use one, if found guilty the OP would have to pay for them.

Car_54

wgl2014 wrote: »

For personal amusement or whatever that's fine, for court though it would be useless. The issue is not that the OP would need an expert witness but that if the accuracy of the measuring equipment is questioned the prosecution would use one, if found guilty the OP would have to pay for them.

Agreed.

Also - although I've never tried - I suspect that measuring a quarter mile accurately would be very difficult without professional equipment. You won't find a 440 yard tape measure in Homebase.

Manxman_in_exile

[quote=[Deleted User];73118481]Agreed.

Also - although I've never tried - I suspect that measuring a quarter mile accurately would be very difficult without professional equipment. You won't find a 440 yard tape measure in Homebase.[/QUOTE]


The OP may not be back for a while. I can picture them with an old wooden 12" ruler, turning it over 1320 times. And then losing count.

Aylesbury_Duck

Manxman_in_exile wrote: »

The OP may not be back for a while. I can picture them with an old wooden 12" ruler, turning it over 1320 times. And then losing count.

Nah, there's a much simpler way. Measure out 440 yards of string at home with the wooden ruler, go out and tie one end of it to a fixing point and mark the kerb with a blob of paint, run along the road until you run out of string and put a blob of paint on the kerbstone at the other end. Hey, presto! You have an accurately calibrated* distance of 440 yards.


*the results may be affected by string tension, curvature of the road and curvature of the earth.

Manxman_in_exile

Aylesbury_Duck wrote: »

*the results may be affected by string tension, curvature of the road and curvature of the earth.

Yeah - but when you started to measure the string you'd have to remember to leave enough at the beginning to allow for the knot, which would need to be pretty substantial to keep the string in tension over 440yds. Otherwise you'd have to start all over again with another 440yds + piece of string. And if you didn't have another piece of string of that length, and if you were doing this at midnight (which is when I'd be doing it) you'd have to wait until the next day when the shops were open again, to buy some more string.


(PS - I know this because in an earlier life I was a trainee Weights and Measures inspector. We used a lot of wooden rulers and string and spent a lot of time loitering outside hardware shops weighting (ha!) for them to open.)

facade

You could simply get a trundle wheel-or Surveyors wheel as the expensive ones would be called, but I doubt if you'd get much better than 2% accuracy over 1/4 mile

Aylesbury_Duck

facade wrote: »

You could simply get a trundle wheel-or Surveyors wheel as the expensive ones would be called, but I doubt if you'd get much better than 2% accuracy over 1/4 mile

Presumably you mean 98% accuracy? If not, that's a pretty poor surveyor's wheel. I'd get more accuracy from a hammer.

Alter_ego

Don't forget old wooden rules have an extra eighth of an inch each end