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noseboy Regular Visitor
Joined: Apr 13, 2006 Posts: 62
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Posted: Wed Apr 18, 2007 9:07 pm Post subject: How does the Nuvi route around traffic? |
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Ran into an oddity today. Travelling with an ETA of 6.50 which suddenly jumps up to 7.15 because of traffic ahead.
When I ask the Nuvi to avoid the traffic it gives me a warning along the lines of "Your route is already optimised for shortest travel time. Are you sure?". Being bloody-minded I say yes and the new ETA is 7.00!
So I don't get it. If it was already going by the optimal route, why does it acknowledge that the route that avoids the traffic is quicker? Also, under what circumstances does it automatically route around traffic? |
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noseboy Regular Visitor
Joined: Apr 13, 2006 Posts: 62
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Posted: Wed Apr 18, 2007 9:07 pm Post subject: |
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Oops, can't seem to edit posts here. If I was awake I would have mentioned originally that it's a Nuvi 610, in case that's important. |
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swing Pocket GPS Verifier
Joined: Nov 04, 2003 Posts: 2225 Location: Bedfordshire, UK
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Posted: Thu Apr 19, 2007 7:18 am Post subject: Re: How does the Nuvi route around traffic? |
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noseboy wrote: | If it was already going by the optimal route, why does it acknowledge that the route that avoids the traffic is quicker? | There are many factors which may have caused this to happen, so it's difficult to work out, however, the difference may have been caused by changes in the traffic data.
Quote: | Also, under what circumstances does it automatically route around traffic? | It doesn't. If you have have full traffic information before you plan a route, it will automatically route around the traffic if that shortens the route. However, once your route is planned, it will not automatically reroute, although it will keep the ETA time adjusted for traffic. In this scenario, you get a red triangle on the screen which allows you to personally choose what traffic to avoid and not avoid on your route. _________________ Please don't be offended if I do not reply to a PM - please ask questions via the forums. |
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noseboy Regular Visitor
Joined: Apr 13, 2006 Posts: 62
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Posted: Thu Apr 19, 2007 7:32 am Post subject: |
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It doesn't automatically route around traffic? That's very confusing given that the avoid traffic error I mentioned above tells you that the route is already optimised for shortest time!
Thanks Swing. |
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swing Pocket GPS Verifier
Joined: Nov 04, 2003 Posts: 2225 Location: Bedfordshire, UK
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Posted: Thu Apr 19, 2007 8:22 am Post subject: |
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Ah well, what it does do is in the background is constantly searches for a better route - should a faster route be found, due to traffic, or just circumstance, it will offer you a choice of changing your route to this new faster route (the same red triangle as before, but with a curvy road inside it) - when you say yes, it will then select the new, faster route.
So, it's not technically lying in that it does ensure you are on the optimised route (as best it can work out at any moment in time), but it does not truly (in my opinion) automatically reroute, although it will automatically offer to apply the reroute (if you see what I mean). _________________ Please don't be offended if I do not reply to a PM - please ask questions via the forums. |
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noseboy Regular Visitor
Joined: Apr 13, 2006 Posts: 62
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Posted: Mon May 28, 2007 6:52 pm Post subject: |
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To reawaken this old thread, I think that it does sometimes automatically reroute.
This weekend I was on my way down to London from Wales via the M4 then the M25, ETA 10.30. Suddenly my ETA went up to about 11.15 (with no traffic symbol being displayed). Then 11.30.
I was saying WTF and then the ETA dropped to about 10.50 and the Nuvi had me come off and go via the North Circular instead. It did this without *any* user intervention so it seems it does re-route in some circumstances.
I was driving (obviously) so couldn't futz with the unit to find out what had happened on the M25 to make it reroute. |
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swing Pocket GPS Verifier
Joined: Nov 04, 2003 Posts: 2225 Location: Bedfordshire, UK
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Posted: Tue May 29, 2007 10:00 am Post subject: |
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noseboy wrote: | To reawaken this old thread, I think that it does sometimes automatically reroute. | It won't automatically reroute around traffic, unless you go off the prescribed route. At that point, the new route will allow for traffic. _________________ Please don't be offended if I do not reply to a PM - please ask questions via the forums. |
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philpugh Lifetime Member
Joined: Dec 28, 2005 Posts: 2003 Location: Antrobus, Cheshire
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Posted: Tue May 29, 2007 10:13 am Post subject: |
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swing wrote: | noseboy wrote: | To reawaken this old thread, I think that it does sometimes automatically reroute. | It won't automatically reroute around traffic, unless you go off the prescribed route. At that point, the new route will allow for traffic. |
Does it avoid congestion when planning a route? I.e. if you have the unit on and it has TMC info doesn't it take this into account when planning the initial route. _________________ Phil |
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swing Pocket GPS Verifier
Joined: Nov 04, 2003 Posts: 2225 Location: Bedfordshire, UK
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Posted: Tue May 29, 2007 10:27 am Post subject: |
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It will, but only if it has the traffic data before you plan the route - I don't receive traffic until after I've left my house, so I already have the route planned, which will be a non-traffic aware route. My Nuvi will now not automatically reroute based on traffic unless I leave that route, or request it to recalculate manually. _________________ Please don't be offended if I do not reply to a PM - please ask questions via the forums. |
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philpugh Lifetime Member
Joined: Dec 28, 2005 Posts: 2003 Location: Antrobus, Cheshire
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Posted: Tue May 29, 2007 11:14 am Post subject: |
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swing - Thanks.
I have only just (yesterday) been getting TMC info at home - I thought that was how it was supposed to work. _________________ Phil |
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noseboy Regular Visitor
Joined: Apr 13, 2006 Posts: 62
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Posted: Tue May 29, 2007 10:50 pm Post subject: |
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swing wrote: | It won't automatically reroute around traffic, unless you go off the prescribed route. At that point, the new route will allow for traffic. |
I can't explain what I saw then. I was on the M25 so it seems doubtful that the GPS misread enough to think I was on a different road, but it did happen just as I described above. |
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