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kartracer
Frequent Visitor
Joined: 26/03/2003 20:15:33
Posts: 502
Location: United Kingdom
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 Posted: Thu Aug 30, 2007 10:05 am Post subject: |
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| DennisN wrote: | | The configurable speed is a great idea and I think I saw somewhere that it used to be available on TTs. Why they did away with it I'll never know, it's so sensible. |
When TomTom were still software producers with Satnav software being just one item amongst a range of their products, their software did indeed have user configurable speed settings. As they changed into producers of GPS hardware with an incidental need to produce Satnav software they did away with user configurable speed settings. I think that they think that PND users can't cope with such complexities, but they also dropped the option for PDA and Smartphone users. 
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beej
Occasional Visitor
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Joined: Feb 07, 2005
Posts: 12
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| Posted: Thu Aug 30, 2007 12:15 pm Post subject: |
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At the start of a journey, my route is overestimated because it assumes I drive like my Gran in a Reliant or something 
During the journey it constantly updates and shaves time off, so actually, I find it is as accurate as it can be, but maybe not right at the start and I'm going to be on a motorway maybe doing 80 not 70. |
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crazyfingers
Regular Visitor
Joined: Aug 08, 2004
Posts: 107
Location: Massachusetts, USA
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| Posted: Thu Aug 30, 2007 3:17 pm Post subject: |
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| DennisN wrote: |
Please educate a simple old man - I have been under the impression for years that USA has a national speed limit of 50mph, which was why Smokey got chased? |
Well, not really. For a number of years starting in the mid-70's the federal government set highway speeds at 55 mph to save on gas. No one followed those speeds. 65 mph was common on the highways.
It's been at least 10 years since the feds lifted that restriction and now the states set their own speeds. I don't really remember when that federal law went away. In most cases it's 65-70 mph speed limit but 70-75 is the much more common actual speed that people drive. Police don't bother with anyone going less than 10 mph over the speed limit.
On smaller roads speed limits tend to be from 25 to 45 mph depending on the road. Again, no one follows the 25 mph speed limits. 25 mph is pretty much a joke. 35-40 in a 25 mph zone would be where most people drive.
Stupidly low speed limits just make people disrespect the alleged intelligence of state and local governments. |
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DennisN
Tired Old Man
Joined: Feb 27, 2006
Posts: 14901
Location: Keynsham
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| Posted: Thu Aug 30, 2007 4:47 pm Post subject: |
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Thank you crazyfingers for an informative and patient reply.  I learn something new most times when I come on this forum.
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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lola
Lifetime Member
Joined: Aug 31, 2006
Posts: 146
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| Posted: Thu Aug 30, 2007 8:16 pm Post subject: |
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During our hols in France this year I constantly found the estimated arrival time to be in error by 25%.
On departing our Gite to return to St Malo, TT estimated a trip of 2hours 41 mins. Autoroute estimated 2 hours 12mins.
The trip took 2 hours 8 minutes sticking (on cruise) at or below the speed limit.
Now 1/2 an hour error when we had to get out of bed at 0445 is rude.
We were staying near St Nazaire and I checked that both Autoroute and TT had planned exactly the same route. |
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technik
Lifetime Member
Joined: Mar 18, 2004
Posts: 789
Location: Midlands UK
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| Posted: Thu Aug 30, 2007 9:10 pm Post subject: |
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In the UK I have found the trip times about right.
It's better to over-estimate than under-estimate, as I would rather be early, than late for an appointment. |
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uocooper
Regular Visitor
Joined: Nov 15, 2005
Posts: 63
Location: Portland, Oregon
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| Posted: Fri Aug 31, 2007 3:31 am Post subject: |
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In the US, the estimates when you use highways that are not interstates can be way off. The longer your trip the more it will overestimate the travel time.
The first test I performed was a roughly 40 mile stretch of Interstate 5 with no cities or towns in between. On the TomTom this is categorized to as a motorway. I then took the longitude and latitude values and used them to perform an advanced planning route on my 720. I was then able to calculate the speed from the distance and length of time given from Google and the 720. The results:
Google- 66 mph
720- 61 mph
The next test was a stretch of US Highway 26 which is categorized as a major/international road. Again the stretch of highway had no towns or cities in between and was about 40 miles long.
Google- 52 mph
720- 40 mph
Hopefully they'll get enough calls about it and it will get fixed either with Map Share or a Navcore update.
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