Splitting out Forward facing cameras e.g. Truvelo

PaulJSmith · Regular Visitor Joined: Apr 08, 2007 Posts: 64

Hi,

Would it be possible to havea seperate file for the Truvelo style of camera's? This would mean that one could easily change the alert distance for this type of camera (I use Adam Mealings GPX converter tool).

Thanks

Paul Smith

MaFt · Posted: Tue Feb 03, 2009 5:32 pm Post subject:

you could manually seperate the files in excel (or similar)?

we have no plans to split the files further a it would mean over 37 files for speed-zoned for the uk and more for european file sets.

MaFt

M8TJT · Posted: Tue Feb 03, 2009 5:33 pm Post subject:

Why would you want to do this? The distance/time of the alert should be sufficient to ensure that you are at or below the speed limit when you arrive at the camera regardless of its direction of detection. (Unless of course you blast up to the cam then slam on the brakes Shocked

). The difference in detection distance between forward and rear facing cameras is aboyt 50 yards max. which is probably a fairly small percentage of the total alert time/distance.
However, if you really wanted to, you could always get a .csv copy of the fixed camera database and split out the forward facing ones (if you could identify them)

Edit. Oops, MaFt got there first with a much better reason

PaulJSmith · Regular Visitor Joined: Apr 08, 2007 Posts: 64

No worries. My thinking was that they are not Gatso and should be in a different file (the file is named gatso after all).

If you have the alert at 70 yards for a 30mph gatso then you get 70 yards before the point of no return.

For the Truvelo you would only get 20 yards (if they fire at 50 yards) which is not enough time to slow down safely. If you up the yardage for the whole group then the gatso alerts tend to go off too far away, especially when there are lots of Gatso's about such as in a city - making it difficult to know whats a false alert or not (as they are not directional either).

I know there are lots of arguments about driving slower etc. so no need to remind me of that - it is for those occasions when you inadvertantly speed.

thanks
Paul

Darren · Posted: Tue Feb 03, 2009 6:03 pm Post subject:

They fire a lot closer than that, 20ft approx. Set your warnings sufficiently and you'll be fine.
_________________
Darren Griffin

M8TJT · Posted: Tue Feb 03, 2009 6:09 pm Post subject:

Hi Paul

MaFt · Posted: Tue Feb 03, 2009 6:10 pm Post subject:

only 70 yards warning for 30mph?! assuming you were travelling spot-on 30mph then that's only 4.77 seconds warning and that also assumes 100% accuracy of GPS signal (realistically you're talking about 10-30yards accuracy at best) as well as the assumption that the POI itself is 100% accurate (again, could be 5-20 yards out) basically leaving you with about 1 second warning - even less if you were actually over the limit initially!

i'd recomend at least 300yards for 30mph camera, at least 600yrds for a 30mph mobile site... by which time your 40 or so extra yards for truvelo camera doesn't really matter!

MaFt

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