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Posted by Scott on March 12, 2008, 2:55 pm


Without the customary rant from Mr Peffers either about the concept of
perfection in an imperfect world or the moral and ethical validity of
using gps to monitor speeds, does anyone have experience with the new
tomtom maps once you get north of the central belt in Scotland?

I drove to Oban and back (different routes) and received numerous
warnings about exceeding the speed limit when I was in a 60 mph zone
driving within the speed limit. I assume there are false 30 or 40 mph
entries. Is this common in rural areas? Are the speed limits set up
using surveying and/or from traffic orders or are they added by some
sort of computer modelling?

Just wondering.

Posted by Richard Corfield on March 12, 2008, 4:15 pm


> Without the customary rant from Mr Peffers either about the concept of
> perfection in an imperfect world or the moral and ethical validity of
> using gps to monitor speeds, does anyone have experience with the new
> tomtom maps once you get north of the central belt in Scotland?
> I drove to Oban and back (different routes) and received numerous
> warnings about exceeding the speed limit when I was in a 60 mph zone
> driving within the speed limit. I assume there are false 30 or 40 mph
> entries. Is this common in rural areas? Are the speed limits set up
> using surveying and/or from traffic orders or are they added by some
> sort of computer modelling?

I've seen a few of these in Yorkshire and wonder if it's a parallel road
or a road that's crossing that confuses it. It's also out of date in
places.

If the government were to mandate this kind of thing some work would be
needed on getting it right. It's not there now.

- Richard

--
_/ _/ _/ _/
_/_/ _/ _/ Time is a one way street,
_/ _/ _/_/ _/_/_/ except in the Twilight Zone

Posted by Darren Griffin - PocketGPSWorl on March 13, 2008, 4:41 am



> Without the customary rant from Mr Peffers either about the concept of
> perfection in an imperfect world or the moral and ethical validity of
> using gps to monitor speeds, does anyone have experience with the new
> tomtom maps once you get north of the central belt in Scotland?
>
> I drove to Oban and back (different routes) and received numerous
> warnings about exceeding the speed limit when I was in a 60 mph zone
> driving within the speed limit. I assume there are false 30 or 40 mph
> entries. Is this common in rural areas? Are the speed limits set up
> using surveying and/or from traffic orders or are they added by some
> sort of computer modelling?
>
> Just wondering.

The limits are recorded in the map data and are obtained from survey,
official data and other sources.

The problem with such data is that even if the recorded limit was
correct at time of surbey, any subsequent change will not be reflected
until it is recorded and released as part of a new map.

--
Darren Griffin
PocketGPSWorld - www.PocketGPSWorld.com
The Premier GPS Resource for News, Reviews and Forums


Posted by Scott on March 13, 2008, 1:08 pm


On Thu, 13 Mar 2008 08:41:58 +0000, Darren Griffin -

>> Without the customary rant from Mr Peffers either about the concept of
>> perfection in an imperfect world or the moral and ethical validity of
>> using gps to monitor speeds, does anyone have experience with the new
>> tomtom maps once you get north of the central belt in Scotland?
>>
>> I drove to Oban and back (different routes) and received numerous
>> warnings about exceeding the speed limit when I was in a 60 mph zone
>> driving within the speed limit. I assume there are false 30 or 40 mph
>> entries. Is this common in rural areas? Are the speed limits set up
>> using surveying and/or from traffic orders or are they added by some
>> sort of computer modelling?
>>
>> Just wondering.
>The limits are recorded in the map data and are obtained from survey,
>official data and other sources.
>The problem with such data is that even if the recorded limit was
>correct at time of surbey, any subsequent change will not be reflected
>until it is recorded and released as part of a new map.

If you look at my posting, these problems occurred at stretches of
road subject to the 60 mph national speed limit. There is no question
of the limit having been lower than 60 mph at the time of survey then
subsequently increased. These are non built up areas with a speed
limit of 60 mph ever since the 60 mph speed limit was introduced, I
think in the late 1970s. Anyway, it is almost unknown for speed
limits to be increased. There is clearly a problem with the data and
I am asking of others have experiences similar difficulties.

Posted by Darren Griffin - PocketGPSWorl on March 14, 2008, 6:34 am



> If you look at my posting, these problems occurred at stretches of
> road subject to the 60 mph national speed limit. There is no question
> of the limit having been lower than 60 mph at the time of survey then
> subsequently increased. These are non built up areas with a speed
> limit of 60 mph ever since the 60 mph speed limit was introduced, I
> think in the late 1970s. Anyway, it is almost unknown for speed
> limits to be increased. There is clearly a problem with the data and
> I am asking of others have experiences similar difficulties.

You asked how the data was collated and I answered. Clearly there is
an error here and there are errors elsewhere as well. Don't shoot the
messenger!

--
Darren Griffin
PocketGPSWorld - www.PocketGPSWorld.com
The Premier GPS Resource for News, Reviews and Forums


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