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philip_de Occasional Visitor
Joined: Aug 22, 2009 Posts: 12
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Posted: Sat Apr 23, 2011 9:44 pm Post subject: HD Live Traffic question, does it keep checking? |
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Hi
On a recent trip using Live HD, on planning the trip HD Traffic showed a 44 minute delay halfway into an hours journey. After a couple of minutes this was updated to a 17 minute delay, a minute or so later we were given the option of a faster route by 38 minutes which we accepted.
After driving for around 15 minutes I decide that given the delay had dropped from 44 to 17 minutes before we accepted another router, that it might have cleared altogether by the time we reached it so re-planned the route, this gave us the original route this time with no delay. On reaching the point where the delay would have been, there were warning signs regarding debris in the road, a 40 mile restriction to speed, and in the hard-shoulder the remains of a smashed up car, but no traffic and no major delay as we kept on moving freely. So clearly the report was correct, but had cleared by the time we got there.
My question is, is HD Live traffic constantly updating keeping in mind the original route may become the fastest route again? Will it automatically put you back on the fastest route if the traffic conditions clear on that route once it has offered you an alternative?
Regards
Phil |
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Darren Frequent Visitor
Joined: 11/07/2002 14:36:40 Posts: 23848 Location: Hampshire, UK
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Posted: Sat Apr 23, 2011 10:01 pm Post subject: Re: HD Live Traffic question, does it keep checking? |
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philip_de wrote: | My question is, is HD Live traffic constantly updating keeping in mind the original route may become the fastest route again? |
Yes
Quote: | Will it automatically put you back on the fastest route if the traffic conditions clear on that route once it has offered you an alternative? |
Yes, if you have it set to re-route automatically, but even if not, it will tell you if a faster route is available. _________________ Darren Griffin |
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philip_de Occasional Visitor
Joined: Aug 22, 2009 Posts: 12
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Posted: Sat Apr 23, 2011 10:11 pm Post subject: |
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Hi
Thanks for the answer, it's hard to know exactly what it is doing while driving with it, so good to know it will revert back if problems clear.
Regards
Phil |
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JaguarV12e Regular Visitor
Joined: Feb 07, 2005 Posts: 171 Location: Cambridge UK
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Posted: Sun Apr 24, 2011 6:49 am Post subject: Re: HD Live Traffic question, does it keep checking? |
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Darren wrote: | philip_de wrote: | My question is, is HD Live traffic constantly updating keeping in mind the original route may become the fastest route again? |
Yes
[ |
Is that an authoritative "yes", or an anecdotal "yes"?
From anecdotal evidence and personal experience I suspect that HD traffic (and RDS TMC) only recheck the original route if delays increase on the current (diverted) route. _________________ Tomtom Go 1005
Tomtom Go 730T |
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gluey Regular Visitor
Joined: Mar 27, 2005 Posts: 208 Location: North East UK
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Posted: Sun Apr 24, 2011 7:36 am Post subject: |
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I often have this as well.
I plan a route and then after a short while it will report a faster route.
take that route and then it reports iam on the fastest route.
But if when then decide to go any other route it will then report "you are on the fastest route" while going another way.
It always says iam on the fastest route no matter which one i take! |
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Darren Frequent Visitor
Joined: 11/07/2002 14:36:40 Posts: 23848 Location: Hampshire, UK
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Posted: Sun Apr 24, 2011 8:59 am Post subject: Re: HD Live Traffic question, does it keep checking? |
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My comments relate to Nav3 devices, haven't used HD Traffic on anything else for a while. Once you have accepted a deviation, they don't continue to check the 'original' route.
There's no point in doing so. What they do is continue to evaluate possible routes and will offer you a faster one if found, taking into account route and traffic conditions. _________________ Darren Griffin |
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AliOnHols Pocket GPS Verifier
Joined: Oct 15, 2008 Posts: 1937
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Posted: Sun Apr 24, 2011 9:07 am Post subject: |
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Not an answer but I guess that an easy(ish) way to check would be to get the SatNav to Navigate a new route to your original destination 5 or 10 minutes after you've been diverted and compare the routes.
It takes just 3 or 4 screen touches to do this (on a Go x30 using RDS-TMC it definitely notifies you if the original route clears up and becomes the fastest again but not with HD it would seem).
Edited by AliOnHols following Darren & MrT's more informed replies. _________________ Garmin Nuvi 2599
Android with CamerAlert, OsmAnd+, Waze & TT Europe.
TomTom GO 730, GO 930, GO 940 & Rider2.
SatMap Active 10 & 20.
Last edited by AliOnHols on Sun Apr 24, 2011 9:24 am; edited 1 time in total |
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MrT Frequent Visitor
Joined: Nov 14, 2003 Posts: 2143 Location: Surrounded by A1, M1 & M25
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Posted: Sun Apr 24, 2011 9:13 am Post subject: |
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From my experience HD traffic does not check for faster routes unless the traffic changes on your current route.
If there was a delay ahead which you had not reached and the TT was now going to avoid that delay, the TT would not check again if the delay ahead on the original route had cleared unless a traffic event occured on the alternative route. _________________ Drivelux |
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JimmyTheHand Frequent Visitor
Joined: Apr 16, 2005 Posts: 386
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Posted: Sun Apr 24, 2011 10:42 am Post subject: |
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gluey wrote: | But if when then decide to go any other route it will then report "you are on the fastest route" while going another way.
It always says iam on the fastest route no matter which one i take! |
There is a point on my way home where I ignore the TomTom as there is usually a queue the other way, despite the queue showing on HD and it telling me I am on the fastest route, just after the turn it recalculates and shows a minute quicker arrival :s (it is only 6 miles) _________________ J. |
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DennisN Tired Old Man
Joined: Feb 27, 2006 Posts: 14901 Location: Keynsham
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Posted: Mon Apr 25, 2011 9:10 am Post subject: Re: HD Live Traffic question, does it keep checking? |
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Darren wrote: | My comments relate to Nav3 devices, haven't used HD Traffic on anything else for a while. Once you have accepted a deviation, they don't continue to check the 'original' route.
There's no point in doing so. What they do is continue to evaluate possible routes and will offer you a faster one if found, taking into account route and traffic conditions. |
Darren's is the absolutely accurate answer.
I run three TomToms side by side all the time, whitevanman doing sameday deliveries to wherever I'm sent, generally decent distances (over 100 miles one way).
TT GO520 with RDS-TMC antenna, Carminat built in device running RDS-TMC through vehicle radio antenna and TT GO550 Live with HD Traffic. Although I always ask for Fastest Route, fuel consumption is important to my wallet, at about 10 or 12 miles to the litre, diversion routes are significant.
All three devices recheck all the time, but with differing results, so I often get the question do I want to use the faster route. I always say YES, but then compare the new route time AND distance with the other device/s. I often see a recalculated route which gives a new ETA only slightly faster, but certainly longer and in those cases, I ignore the new route - over 150 miles, I don't care to save seven minutes, nor fifteen minutes, and I'll even think carefully about 30 minutes if the re-route is 20 miles extra - that's nearly £3 out of my pocket!
Think about what Darren said. You're using a computerised device and we all know they are totally logical. Faster means faster, whether by a day or a minute. If one of the frequent (minutes?) checks comes up with another faster route, it'll be offered. Chances are if you haven't already started on the original diversion, the new "fastest route" can be the original, but only by coincidence, it's a complete new calculation by computer which doesn't remember the first route. _________________ Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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IanS100 Frequent Visitor
Joined: May 05, 2008 Posts: 870 Location: Southport
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Posted: Mon Apr 25, 2011 10:10 am Post subject: Re: HD Live Traffic question, does it keep checking? |
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I've never seen my 550 go back to the original route! On a few occasions when coming back from Wales to Southport via the Runcorn Bridge I've accepted a reroute via the Mersey tunnel due to traffic on the Runcorn Bridge. The Tunnel remained the TomTom's route of choice until I did a last minute manual 'new route' check & seeing no traffic on the Bridge the 550 suggested that as the new quickest route!! It suggests that once rerouted manual route checks are necessary for accurate information
DennisN wrote: | You're using a computerised device and we all know they are totally logical. Faster means faster, whether by a day or a minute. |
I often travel from Blackpool to Southport and the route suggested is invariable M55, M6, M58 at 47 miles compared with the non-motorway route through Preston being 33 miles. The 14 mile longer motorway route is suggested even if the time taken is only a minute quicker which is really annoying but as DennisN says it's a computer and faster is faster!!
Last edited by IanS100 on Mon Apr 25, 2011 1:37 pm; edited 1 time in total |
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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 Apr 25, 2011 1:16 pm Post subject: |
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I think I remember TT saying once that the devices won't bother to re-route you a second time if the improvement is less than ~5 minutes.
That's why you can often force it to take a different route and find it's a minute or so quicker than the "fastest". |
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IanS100 Frequent Visitor
Joined: May 05, 2008 Posts: 870 Location: Southport
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Posted: Mon Apr 25, 2011 1:44 pm Post subject: |
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Just a thought; if HD traffic suggests a modified route maybe we should then do a full 'New Route' check - at least that way HD Traffic will be keep checking ALL alternative routes including the one we'd originally chosen!! |
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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 Apr 25, 2011 6:16 pm Post subject: |
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The problem with doing a frequent new route check on the older units is on a long route it takes quite some time to recalculate the route and apply the traffic data, so you need to do this a least a couple of minutes in advance of the decision junction. _________________ Drivelux |
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