False Alerts on Tomtom One XL

Paul317 · Occasional Visitor Joined: Jun 04, 2007 Posts: 18

If you are on the M5 passing junction 17 (Cribbs Causeway), either north or southbound, you get a mobile 30 alert and a redlight camera alert. The mobile camera is 6091 and just off the motorway. There are 4 redlight cameras grouped closeley together - 9471, 9472, 9202 and 9203 - I dont' know which one generates the warning. I have my Tomtom One XL set to warn only if on route. Is this a Tomtom bug or a bug in the Safety Camera Database?

Oldboy · Posted: Mon Oct 22, 2007 8:05 pm Post subject:

It's probably 9471. It's only 30 yards from the Motorway and 'on Route' carries a certain amount of left- and right-hand sweeping.

Also the screen position of roads on the Device are not necessarily 'real life'. Close, but just a graphical depiction.
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TT 910 V7.903: Europe Map v1045
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Andy_P · Posted: Tue Oct 23, 2007 12:18 am Post subject:

Recent versions of the TomTom software and maps have widened the scope of what is considered "on route". I get a lot more false alerts now on specific cameras that have not moved in the database.

The worst situation is at motorway junctions the sliproads and the usual roundabout at the end of them are now considered "on route" even when you are staying on the motorway. This didn't used to be the case with v5 software but was bought in with one of the v6 versions.

Paul317 · Occasional Visitor Joined: Jun 04, 2007 Posts: 18

According to Autoroute the mobile camera is 97 yards away from the motorway and the nearest redlight camera is 44 yards away. I would say that anything more than 10 yards should be considered off-route. I didn't have a TomTom back in the V5 days but it sounds like they had a better algorithm then.

Daggers · Posted: Tue Oct 23, 2007 10:18 am Post subject:

I have a similar situation close to where I live (on the A34, near the M42 junction). There is a camera on the northbound side of the dual carriageway, just north of a roundabout. If I travel southbound, I always get warned about this northbound camera, just as I am about to pass it.

My belief is that I am getting warned because I could potentially go round the roundabout and back past the camera, as this roughly corresponds to the warning distance I get. The warning is far too close to be due to "right-hand sweeping".

Andy_P · Posted: Tue Oct 23, 2007 12:14 pm Post subject:

Paul317 · Occasional Visitor Joined: Jun 04, 2007 Posts: 18

Andy_P · Posted: Tue Oct 23, 2007 2:33 pm Post subject:

True, but my main point is that TT aren't interested in changing things to make it work for OUR camera database, when they are trying to sell us their own.

Paul317 · Occasional Visitor Joined: Jun 04, 2007 Posts: 18

Take your point. However, I feel that they ought to be concerned that "on route" should mean just that, and not "on another road running parallel but 100 yards away"!

Andy_P · Posted: Tue Oct 23, 2007 3:02 pm Post subject:

I quite agree, it annoys me too!
But it looks like they've changed it deliberately, for whatever reason... Crying or Very sad

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