I know that it is hard to believe, but things are changing also in the
"belpaese".
Expensive fines and points on the driving license, together with a widely
increasing of culture of safety are bringing to the first good results.
So, now we are becoming part of the great famility that need to know what is
the speed limit on the actual road ;-) !
Ciao!
Fabrizio
> -----Messaggio originale-----
> Da: [email protected]
> [mailto:[email protected]]per conto di Mike Harris
> Inviato: venerdi 8 maggio 2009 20.45
> A: [email protected]
> Oggetto: Re: [OSM-newbies] R: R: Road Maximum speed in UK units
>
>
> ... d'accord!
>
> My only puzzle now is to wonder why I am e-mailing an Italian about speed
> limits - didn't think you had them in "la bella Italia" - strange thing is
> the only ticket I have ever had was in the USA ...
>
> ... And don't you just love those crazy speed limit pictures that
> got posted
> in this thread!
>
> Ciao!
>
> Mike Harris
>
> -----Original Message-----
> From: Fabrizio Carrai [mailto:[email protected]]
> Sent: 08 May 2009 13:46
> To: [email protected]
> Subject: [OSM-newbies] R: R: Road Maximum speed in UK units
>
> Because you forget ""When in Rome, do as the Romans" (you teached!! ;-) )
> While we are having fun, we also addressed a more serious subject:
>
> Render max speed limits, according to WHERE you are and if and what speed
> reference you need or you have.
>
> On the contrary of you, when I'm in USA I want that my navigator
> alert me in
> mph (and not in unuseful km/h).
> In UK, I have no problem: I avoid to drive on the "wrong" side of the road
> ;-) !
>
> Ciao!
> Fabrizio
>
> > -----Messaggio originale-----
> > Da: [email protected]
> > [mailto:[email protected]]per conto di Mike Harris
> > Inviato: venerdi 8 maggio 2009 13.56
> > A: [email protected]
> > Oggetto: Re: [OSM-newbies] R: Road Maximum speed in UK units
> >
> >
> > Personally, when stopped for speeding on the Continent, I pretend to
> > speak
> > (only) English and claim that I thought the sign meant mph - this does
> > not usually work - I can't understand why not (;>) ...
> >
> > Mike Harris
> >
> > -----Original Message-----
> > From: Fabrizio Carrai [mailto:[email protected]]
> > Sent: 07 May 2009 16:19
> > To: [email protected]
> > Subject: [OSM-newbies] R: Road Maximum speed in UK units
> >
> >
> >
> > > -----Messaggio originale-----
> > > Da: [email protected]
> > > [mailto:[email protected]]per conto di Thomas König
> > > Inviato: giovedi 7 maggio 2009 11.12
> > > A: [email protected]
> > > Oggetto: Re: [OSM-newbies] Road Maximum speed in UK units
> > >
> > >
> > > 1) Only for clarification: hour is NOT an SI-unit. So when measuring
> > > in km/h we can't complain about the ridiculous unit system in
> the US/UK.
> >
> > You are right, but just to give a rationale to what we are
> > doing: [1] says:
> >
> > "The SI base unit for time is the SI second. From the second, larger
> > units such as the minute, hour and day are defined, though they are
> > "non-SI" units because they do not use the decimal system, and also
> > because of the occasional need for a leap second. They are, however,
> > officially accepted for use with the International System"
> >
> > More info in [2]. I think that this should support the continuation of
> > the use of "hours" as time unit.
> >
> > >
> > > 2) I think it shouldn't be too hard for a computer to convert units!
> > > (Regardless of the fact if someone uses kph, kmh, k.p.h. or whatever
> > > abreviation.) Isn't that what computers are made for - calculations?
> > > Regarding the loss of accuracy: As speed limits are always integers
> > > (and I guess all over the world they should be divisible by 5) the
> > > computer
> > > (renderer) should be able to perform the conversion without loss of
> > > accuracy!
> > >
> >
> > Computer are built to compute, but we cannot abuse of it!
> > Computing power is
> > a limited resource and we shoudn't waste it doing extra calculations.
> >
> > Things change day-by-day, but mobile devices are still less powerful
> > than the desktop PCs.
> > I think that all of you agree that we (as OSM mappers) often act as
> > "Data designer". Although the "Data Designer" objectives are different
> > than the "Application Designers" we cannot avoid to think to the use
> > of our product.
> > That means that our "product" must be "usable" in the best efficent way.
> >
> > The reason of the discussion is to find the best way to tag the speed
> > limits avoiding extra effort during their use.
> >
> > So , my personal propose would be:
> >
> > a) Let the mappers to use their own units
> > b) Set the requirements for the application to convert all such data
> > according to well know function to a SI (or an accepted unit). e.g.
> > meters for distances, km/hours for speeds
> >
> > Point a) is "justified" by the fact we want to map the reality and the
> > reality is that in saxon countries the signals are in Mph. As Mike
> > said ""When in Rome, do as the Romans" !
> > Of course that strongly simplifies the job for the UK mappers, with
> > the request to add the info that explicit the unit. [4] indicates that
> > there is still a certain standardization. I don't know if this is the
> > best solution for a data processing application.
> > We have also to say that this is still in compliant with the wiki [3]
> > "UK mappers will often include units in the maxspeed tag, ie:
> > maxspeed=20 mph (miles per hour)".
> > A more literally aderence to the standard, i.e.
> > "value"-space-[unit], could
> > support the string tokenizer function (many of them require a
> > separating character).
> >
> > In my opinion that's not a detail. Think to a routing application that
> > load the speed limit indications and has to check if a unit has been
> > specified and do the proper conversion all the time. This operation
> > should have to be do done on each speed value that is in a tag!.
> >
> > Point b) limits the action in point a). Only standardized units should
> > be specified, since the application shall rely on the list of the
> standard.
> > Still free to add "furlongs per fortnight" as unit, just specify the
> > converting function to SI in the wiki.
> >
> >
> > Ciao!
> > Fabrizio
> >
> >
> > [1] http://en.wikipedia.org/wiki/Time
> > [2] http://physics.nist.gov/cuu/Units/outside.html
> > [3] http://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Maxspeed
> > [4] http://tagwatch.stoecker.eu/Great_britain/En/tags.html
> >
> >
> >
> >
> >
> > _______________________________________________
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>
>
>
>
>
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