Estimated Journey Times

jguiver · Posted: Fri Nov 04, 2005 11:59 am Post subject: Estimated Journey Times

My apologies if this has been asked before and I have failed to search the forums adequately:

1. How does TTN5.1 calculate journey times?
2. What speeds does it use for different road types, assuming that's how it performs the calculations?
3. Is there a way of accessing the defaults and adjusting them?

From what I have read, this was possible in some earlier versions, but this may have been the subject of an 'enhancement'.
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lupos0_1 · Posted: Fri Nov 04, 2005 12:52 pm Post subject:

Tomtom calculates the journey times by speeds that have been programmed in.

I believe that M'ways - 75MPH.

You could change the default speeds in V3 but not in V5, something that a lot of people complain about.

I find the best way to find out what speeds it uses is to plan a route in advanced planning and then play a route demo. The speeds will show you what tomtom uses.
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Bazzer · Posted: Fri Nov 04, 2005 1:57 pm Post subject:

This is something that I have previously queried. I am hoping that some of the techy people on this forum can answer this....

In CoPilot, while the road speed were not adjustable via the interface, it was possible to edit the part of the programme that contained the speeds.

These were held in a config file and this could be edited in Notepad and put back into the programme. Does anyone know where default road speeds are held in TT5, and can this file be edited ??

Cheers

Baz
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jguiver · Posted: Fri Nov 04, 2005 2:38 pm Post subject:

joni · Occasional Visitor Joined: Jun 03, 2004 Posts: 48

I'm certainly not learned in this, but I think I recall that TT3 default for motorways was 65 mph which seemed sensible enough given the likes of the M25 etc.
I find it difficult to believe that the new fixed average speed on TT5 exceeds the speed limit.

gekko · Occasional Visitor Joined: Sep 01, 2005 Posts: 25

Well, believe it or not but this is what we have here in Norway:

Speed limit on most "motorways" (the best roads) are 80-90 km/h, on a very few places it is 100 km/h. TT5 uses 120 km/h when calculating a route on these roads. Needless to say that TT5 "always" wants you to go to a motorway, even if it is WAY out the intuitive route.

I second the idea by "Bazzer", someone with the ability should take a look at the TT5 program. The defined speeds are in there somewhere just waiting to be edited/corrected to real life. Wink

spangelsaregreat · Occasional Visitor Joined: Jun 24, 2005 Posts: 22

I find that driving at the speed limits and making maximum safe progress I am always arriving 5 to 10 minutes ahead of Tom Toms estimated times.

Obviously rush hour makes it upredictable but overall the timings are never out by much more than that.

Oldboy · Posted: Fri Nov 04, 2005 7:57 pm Post subject:

Bazzer · Posted: Sat Nov 05, 2005 4:26 pm Post subject:

Hi Oldboy

Can the default road speed data be edited in any way, as can be done with CoPilot ? ie, editing the .Cfg file in Notepad, or similar, and re-inserting in the programme etc.

Cheers

Baz
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TomTom Go 730 (RIP)
Garmin Montana 650
Garmin Oregon 45oT
Garmin Edge 1000
Tracklogs Digital Mapping

Oldboy · Posted: Sat Nov 05, 2005 8:28 pm Post subject:

No. That is held in the Map Data. Some Navigation Software have the ability to set up which which type of road you prefer (on a sliding % basis), but not TT.

The limited speed option on TT, say 55mph, just means that when building the route, TT treats all roads that are faster than that as having the same priority as the slower ones. You end up going down nearly every track. Rolling Eyes

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thekirbyfake · Posted: Fri Nov 11, 2005 4:14 pm Post subject:

thekirbyfake · Posted: Fri Nov 11, 2005 4:21 pm Post subject:

jguiver · Posted: Fri Nov 11, 2005 9:18 pm Post subject:

leonardo1 · Posted: Thu Nov 24, 2005 2:33 pm Post subject: Old news

This may be old news to some of you, but last weekend I drove back from Coventry to Surrey and I was doing between 75-80 on M40.

I also have TTN5.1 to show the speed and most of the time it was showing 3-4 mph below the actual speed I was driving and consequently the ETA was about 10-15 mins longer than the actual journey time.

Not brilliant but not that bad either.
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MJN · Posted: Thu Nov 24, 2005 2:39 pm Post subject:

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