HD Live Traffic question, does it keep checking?

philip_de · Occasional Visitor Joined: Aug 22, 2009 Posts: 12

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

Darren

philip_de · Occasional Visitor Joined: Aug 22, 2009 Posts: 12

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

JaguarV12e

gluey · Posted: Sun Apr 24, 2011 7:36 am Post subject:

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!

Darren

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.
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Darren Griffin

AliOnHols · Pocket GPS Verifier Joined: Oct 15, 2008 Posts: 1936

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.
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MrT · Posted: Sun Apr 24, 2011 9:13 am Post subject:

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.
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Drivelux

JimmyTheHand · Frequent Visitor Joined: Apr 16, 2005 Posts: 386

DennisN

IanS100 · Last edited by IanS100 on Mon Apr 25, 2011 1:37 pm; edited 1 time in total

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

Andy_P · Posted: Mon Apr 25, 2011 1:16 pm Post subject:

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".

IanS100 · Posted: Mon Apr 25, 2011 1:44 pm Post subject:

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!!

MrT · Posted: Mon Apr 25, 2011 6:16 pm Post subject:

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.
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