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imacken
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Joined: May 24, 2005
Posts: 26
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 Posted: Tue Jul 05, 2005 2:52 pm Post subject: Speed Camera Database - changing directional sensitivity? |
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Just got my TTG700 and put on the Speed Camera database from this site. I was wondering if there was any way of making it directionally sensitive like my Road Angel. At the moment both sides of the carriageway are detected making things a little awkward.
I'm not meaning to moan as it is a fantastic set of data to get free, but I only wondered! |
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Ugly-Kid-Joe
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Joined: Sep 08, 2004
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Location: Cornwall
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| Posted: Tue Jul 05, 2005 3:18 pm Post subject: |
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| In the menu under Manage POI there should be a tick box that say "Warn only on route" tick this for all you speed cameras. That should do the trick |
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imacken
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Joined: May 24, 2005
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| Posted: Tue Jul 05, 2005 3:27 pm Post subject: |
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| Unfortunately not. I already had that ticked. Being 'on route' is obviously not directionally sensitive in the database, either side of the road will do. Very annoying because you get 2 warnings in fairly short succession and it is not clear at the time what side of the road is relevant! |
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Ugly-Kid-Joe
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Location: Cornwall
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| Posted: Tue Jul 05, 2005 3:32 pm Post subject: |
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Yeah wasn't to sure, i surpose because the go sanps to a road it takes in both carriage ways as being on route. I don't think there is anything else you can do. Unless anyone else has the answers.  |
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imacken
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Joined: May 24, 2005
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| Posted: Tue Jul 05, 2005 3:36 pm Post subject: |
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| Road Angel is smart enough to detect what side of the road is relevant, so why not TTG? |
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HairyBoy
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Joined: May 20, 2005
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| Posted: Tue Jul 05, 2005 6:11 pm Post subject: |
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Road Angel is designed for the purpose of Safety Camera notification.
With Go the speed camera database simply utilises the "Point of Interest" facility which was primarily designed to alert the user to Hospitals, petrol stations, etc. which are relavent when travelling in either direction on a road.
Maybe in future software releases TomTom will build in a speed camera bolt-on (which doesn't use the POI facility) which will be more direction sensitive as it will be designed specifically for the purpose. Until then the only way to get the cameras on your Go is using the POI data. |
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imacken
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Joined: May 24, 2005
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| Posted: Tue Jul 05, 2005 6:29 pm Post subject: |
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Well, I'm not so sure.
Here is a quote from the Tomtom manual in reference to the 'on route' option:
'You'd typically only tick this for items that have to be on the roadside and in your direction of travel. For example, petrol stations, as there's no point in warning you if they're on the opposite carriageway or in a parallel road.'
Same thing applies to cameras, does it not? |
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Zuke
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Joined: Mar 29, 2004
Posts: 123
Location: Cornwall
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| Posted: Tue Jul 05, 2005 6:53 pm Post subject: |
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| imacken wrote: | Well, I'm not so sure.
Here is a quote from the Tomtom manual in reference to the 'on route' option:
'You'd typically only tick this for items that have to be on the roadside and in your direction of travel. For example, petrol stations, as there's no point in warning you if they're on the opposite carriageway or in a parallel road.'
Same thing applies to cameras, does it not? |
Yes it does. The TTG 'knows' which carriageway you are on. If you're getting alerts for cameras on the opposite carriageway of a dual carriageway, either the camera POI is wrong, or you aren't set up properly for 'on route' warnings. |
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Oldboy
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Joined: Dec 08, 2004
Posts: 10642
Location: Suffolk, UK
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| Posted: Tue Jul 05, 2005 6:56 pm Post subject: |
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| imacken wrote: | | Unfortunately not. I already had that ticked. Being 'on route' is obviously not directionally sensitive in the database, either side of the road will do. Very annoying because you get 2 warnings in fairly short succession and it is not clear at the time what side of the road is relevant! |
The Warn when on Route seems to limit at about 15 yards, left and right, and as far forward as your warning distance.
If the Warn when on Route is not ticked it will pick up POI in a semi-circle, left-forward-right , in your direction of travel at the range of your warning distance.
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Richard
TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1120 |
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imacken
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Joined: May 24, 2005
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| Posted: Tue Jul 05, 2005 7:02 pm Post subject: |
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Richard,
All I know is that this is what happens:
I have got the 'on route' checked correctly for the cameras POI.
TTG correctly identifies the camera nearest to my home in the direction I'm travelling in, BUT a few seconds later, it sets off a warning again for the one at the same (approximate) location on the opposite side.
Iain |
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MikeB
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Location: Essex, UK
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| Posted: Tue Jul 05, 2005 7:49 pm Post subject: |
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| imacken wrote: | Richard,
All I know is that this is what happens:
I have got the 'on route' checked correctly for the cameras POI.
TTG correctly identifies the camera nearest to my home in the direction I'm travelling in, BUT a few seconds later, it sets off a warning again for the one at the same (approximate) location on the opposite side.
Iain |
This is fine as the POI is on your route (you do not mention that it is a dual carriageway) and exactly how the system was designed to work. See my article on TomTom GO POIs for a more detailed description.
POIs do not have any concept of direction ie if there is a camera situated in the centre of the road thare is no way to tell the POI database which way it is facing. Not only that but some of the POIs will have been recorded on the wrong side of the road therefore appearing to be on the correct side.
This brings back an interesting discussion that we had some time ago about "false" warnings. My point of view is that any warning is just that a warning to check your speed. It is really a bit mute as to which way the camera is facing as you are using the database to ensure that you know where the accident blackspots are. If they put a camera on one side of a road it is safe to assume that the danger exists on both sides. Or are the Partnerships just collecting money?
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imacken
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Joined: May 24, 2005
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| Posted: Tue Jul 05, 2005 8:07 pm Post subject: |
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Mike,
Now you've totally confused me!
In your post, you say 'POIs do not have any concept of direction ie if there is a camera situated in the centre of the road thare is no way to tell the POI database which way it is facing.'
Yet, in the article you wrote, you say '(1) if the on-route is set, only POI that are on your route, on YOUR side of the road, are included'.
Why is it then correct for TTG to detect both the cameras on my side of the road as well as those on the right hand side when the 'on route' option is ticked?
Iain |
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MikeB
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| Posted: Tue Jul 05, 2005 8:19 pm Post subject: |
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You are quoting from the TomTom devopment director not me.
I state in the article | Quote: | A feature of the software I tested was the POI being "on route". I did find this a problem with some POIs.
The reason for this is that when traveling down a dual carriageway the POI is recorded from the other side of the road, or in some cases where there are 2 cameras on opposite sides of the road the database only has one recorded.
Why would this matter? Well TomTom checks the route for POIs in the case where the POI is recorded and showing on the wrong side of the carriageway then it is deemed not to be on route. i.e. more than the warning distance away. Therefore you are not warned. This didn't happen very often, but is a cause for concern.
Another example of failed warnings is when the POI is recorded a distance from the road. Again the software does not see this as being "on route"
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TomTom regards a dual carraigeway as 2 distinct roads, both of which are one way. Therefore if a poi is on the otherside of the dual carriageway and cannot be reached via a turnoff within a few yards then it is not on route. I hope that makes sense.
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imacken
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Joined: May 24, 2005
Posts: 26
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| Posted: Tue Jul 05, 2005 8:24 pm Post subject: |
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Mike,
Are you saying that the 'on route' option will work on dual carriageways, but not on other roads?
The case I mentioned earlier is on a 3 lane 2-way single carriageway.
Why is this sort of thing not a problem for my Road Angel?
Thanks
Iain |
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Oldboy
Pocket GPS Moderator
Joined: Dec 08, 2004
Posts: 10642
Location: Suffolk, UK
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| Posted: Tue Jul 05, 2005 8:26 pm Post subject: |
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| imacken wrote: | Mike,
Now you've totally confused me!
In your post, you say 'POIs do not have any concept of direction ie if there is a camera situated in the centre of the road thare is no way to tell the POI database which way it is facing.'
Yet, in the article you wrote, you say '(1) if the on-route is set, only POI that are on your route, on YOUR side of the road, are included'.
Why is it then correct for TTG to detect both the cameras on my side of the road as well as those on the right hand side when the 'on route' option is ticked?
Iain |
The TomTom has a corridor of perception that is some 30 yards wide. This is to allow for inaccuracies in POI placement, perhaps a mis-alignment in the road, or a road adjustment.
If TT sees that a POI is within 15 yards approx. of your road (carriageway), it will assume that it's on your route. On a bridge over your route, a POI will still be seen, as TT has no concept of altitude either, even if it doesn't cover your route.
In the camera context TT would not be aware of the function of it, but only that it was within it's scan range.
If you made the 'corridor' any narrower it would possibly miss POI's.
_________________
Richard
TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1120 |
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