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ijwoo1 Occasional Visitor
Joined: Dec 25, 2008 Posts: 5
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Posted: Mon Feb 23, 2009 7:51 am Post subject: IQ Routes Suck ! |
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Two cars guided by tomtoms set off early one Sunday morning from Val d'Isere heading to the Eurotunnel . One uses IQ routes and TMC, the other doesnt. Which one goes through the centre of Paris ?
Needless to say IQ routes has now been disabled ! |
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Moreno Occasional Visitor
Joined: Oct 11, 2005 Posts: 34 Location: Dartford
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Posted: Mon Feb 23, 2009 12:11 pm Post subject: |
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ooppsss |
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matthewj Frequent Visitor
Joined: Apr 03, 2006 Posts: 751
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Posted: Mon Feb 23, 2009 5:01 pm Post subject: |
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That sounds obviously bad, but presumably the logic is that there are fast routes into and out of Paris, and the direct route is slower. Paris would obviously add time, but perhaps overall should be better.
Did the cars actually take those routes, or was this just theoretical? |
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Moreno Occasional Visitor
Joined: Oct 11, 2005 Posts: 34 Location: Dartford
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Posted: Mon Feb 23, 2009 5:05 pm Post subject: |
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Yeh id be interesting in knowing that as it was the IQ routes which swayed me towards tom tom and away from garmin |
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ijwoo1 Occasional Visitor
Joined: Dec 25, 2008 Posts: 5
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Posted: Mon Feb 23, 2009 6:03 pm Post subject: |
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matthewj wrote: | Did the cars actually take those routes, or was this just theoretical? |
Unfortunately the cars took the routes with me coming off the worst . So the routes were actual not theoretical ! It wasnt the only significant difference either, the two routes shared very little and the sections of my route were consistently worse than the "dumb" route. In total it took over an hour longer on a 10hr journey.
I might forgive it if any part of my journey was quicker, but all I can say is mine was characterised by heavy traffic over large sections of the journey whilst the other was clear.
Even on the outward journey, mine selected an IQ route which was 20 minutes longer than the "dumb" route, sending us different ways within minutes of getting off the Eurotunnel. Again I naively trusted mine and ended up catching my friend up at a service stop. |
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Andy_P Pocket GPS Moderator
Joined: Jun 04, 2005 Posts: 19991 Location: West and Southwest London
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Posted: Mon Feb 23, 2009 8:39 pm Post subject: |
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Just for info, do you know what map versions you were both using? |
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MrT Frequent Visitor
Joined: Nov 14, 2003 Posts: 2143 Location: Surrounded by A1, M1 & M25
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Posted: Mon Feb 23, 2009 9:10 pm Post subject: |
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Which traffic system were you using as IQ routes only uses historic average speed data and has no idea of current traffic without this? _________________ Drivelux |
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emjaiuk Frequent Visitor
Joined: Dec 06, 2003 Posts: 335 Location: North Surrey (TW17) UK
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Posted: Mon Feb 23, 2009 10:01 pm Post subject: |
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Andy_P wrote: | Just for info, do you know what map versions you were both using? |
Quite an important question, I've noticed a difference in regular routes since upgrading to my 740, e.g. from the Tunnel, it now wants me to use the A16 to CDG, whereas with the 910 it was always A26/A1, I had to force it to use the A16. This is between midnight and 3 am. I've limited experience of either in busy periods, but at night there should be less than 5/10 mins difference. It would be nice if TT's told you what they were doing on IQ routes. _________________ Go740L App 9.510 Europe 985.8155
RDS_TMC mount
Home 2.8.3.2499 Win10 Home |
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ijwoo1 Occasional Visitor
Joined: Dec 25, 2008 Posts: 5
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Posted: Tue Feb 24, 2009 11:18 am Post subject: |
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I was using the RDS TMC addon with the GO 740. I'll have to find out what map version the older TomTom was using, but the 740 is the latest European 2GB map.
The traffic on my route was moving at about 75% of top speed, so probably not enough to register as a traffic delay via RDS TMC ??
The traffic density was pretty consistent on my journey, in other words normal for a Sunday, at the end of UK half-term week and in the middle of French school holiday periods ! But I bet IQ routing does not factor this in.
On this experience atleast, it is a nice idea but ultimately rather flawed and arguably pointless - you are still very much at the mercy of lady luck.
Had the journey been in the UK it would have been interesting to see if HD traffic would have been sensitive enough to override the IQ route. |
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Steveee Lifetime Member
Joined: Dec 16, 2003 Posts: 203 Location: Colchester, Essex
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Posted: Tue Feb 24, 2009 12:23 pm Post subject: |
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I was intrigued and planned the same route on my GO920 using IQ routes. and map version 815. I got the same route through Paris. Turned off IQ and avoided Paris as expected. I also accepted toll roads.
The premis of IQ routes is a good one, but as with all forecasting based on statistics, you need enough data before the forecast bears a resemblance to the real world.
I also ran the IQ route based on leaving Val d'Isere at 11:15 on a Thursday. The result was very different, i.e. avoided Paris like the plague. So clearly it is taking account of forecast road conditions on different days.
As IQ routes data is associated with the map download, it will be interesting to run the same journey using the next map release to see if we get the same answers. _________________ Steveee
Where am I?
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GO 920 (retired)
Garmin Oregon 550T
Garmin Drivesmart |
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Steveee Lifetime Member
Joined: Dec 16, 2003 Posts: 203 Location: Colchester, Essex
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Posted: Fri Feb 27, 2009 5:53 pm Post subject: |
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OK, sad person that I am , I reran the Val D'Isere to Calais route with the new 825 map. I planned the route for a Sunday morning and it still routes via Paris forecasting a journey time of 10:06.
That being said, the forecast time is fairly close to the actual time experienced by ijwoo1. So IQ routes is accurate for this route. The problem is why does it belive the faster route is even longer
I then used "Find alternative" to avoid Paris - you can just select the whole city to avoid - the reroute then avoids Paris and forecasts a slightly longer journey time of 10:08
I suspect that there is something on the alternative route that is being heavily weighted skewing the result in favour of Paris as the non IQ routes forecast is 8:55 and this avoids Paris like the plague _________________ Steveee
Where am I?
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GO 920 (retired)
Garmin Oregon 550T
Garmin Drivesmart |
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