[OSM-newbies] R: Speed Limits

[Thomas Meller]

IMHO setting a speedlimit does not do a good job for every case.
Does it count for bicycle riders?
Does it count for motorbike riders?
Does it count for pedestrians?

OSM, as I understood, aims at being a universally usable source for orientation and routing
for every type of traffic.

Reasonable speedlimits are very individual. They depend on the driver's/rider's skills, the vehicle used, the way's inclination, load, daily mood and goal aimed at.

Think of a lorry, filled with the driver's furniture, crossing a mountain pass.
Compare it with a motorbike, rider and sozius, packed with tent and air mattresses, on a holiday trip through the Schwarzwald.
Or have a look at a couple on a tandem bike, crossing the Swiss Alps in their holidays - or the Netherlands.

As a hint for speed, the vehicle type, the street's width, the count and shape of curves and the current traffic situation are much more reasonable.

I have some ideas for judging the shape of a curve, but am not capable to make a code example.
Maybe someone already has some programming experience and likes a trial? The task is not really profane and depends highly on the quality of the OSM-data, but I think it should be possible to write an interface for judging a way's shape independent of the vehicle type.





-------- Original-Nachricht --------
> Datum: Sun, 7 Dec 2008 12:50:34 +0100
> Von: "Fabrizio Carrai" <fabrizio.carrai at gmail.com>
> An: newbies at openstreetmap.org
> Betreff: [OSM-newbies] R:  Speed Limits

> What Rally is saying is more than correct for the current level of
> navigators. But thinking to an innovative navigator, the John's
> information
> looks very interesting.
> Exact time travel could be estimated using the correct speed limit
> available
> at the road's usage time. But we could also think to something for
> evoluted:
> the variation of the speed could be not only function of the time, but
> also
> of the assesed traffic ondition (statistically or real time assessed).
> 
> I think that having tags supporting the John's data, could add an
> interesting support to very advanced applications.
> 
> I'm a recent contibutor to the OSM project, and I would like to use this
> thread to learn a bit more on the common idea to be used to add tags (and
> to
> propose new ones..) to the ways.
> >From other threads I understood (please, correct me), that we do not map
> for
> the application and its capabilities (render, navigator, etc..) but more
> for
> the completeness of the informations that, indeed, coudl drive any kind of
> application.
> Looking from a more high point of view is a kind of life-loop: data exists
> because there are applications that use them, and applications could
> exploit
> new features only if the map data are adequately detailed.
> 
> Fabrizio
>   -----Messaggio originale-----
>   Da: newbies-bounces at openstreetmap.org
> [mailto:newbies-bounces at openstreetmap.org]Per conto di Rally de Leon
>   Inviato: venerdì 5 dicembre 2008 20.10
>   A: john at swajime.com; newbies at openstreetmap.org
>   Oggetto: Re: [OSM-newbies] Speed Limits
> 
> 
>   The most practical use of maxspeed on maps is to estimate the "travel
> time" of a particular route in a gps map of a navigational device, rather
> than just warn you if you are above the speed limit.
> 
>   It's always better to use the conservative value (lower speed limit) to
> estimate your travel time (so that the gps device can calculate and show
> you
> that fastest route without breaking the max speed)
> 
> 
>   On Fri, Dec 5, 2008 at 10:09 PM, John Wesley Simpson <john at swajime.com>
> wrote:
> 
>     Howdy,
> 
>     I'm trying to use maxspeed to put in speed limits for roads in my
> local
>     area.
> 
>     One of the roads has a speed limit of 55mph if you are northbound, but
>     50mph if you are southbound.
> 
>     Another road has a speed limit of 70mph in the daytime, but 65mph at
>     nighttime.
> 
>     How should these be entered?
> 
>     Is there a web-page that specifically explains how to enter these
>     situations into the editor?
> 
>     --
>     John Wesley Simpson <john at swajime.com>
>     SwaJime's Cove
> 
> 
> 
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>     newbies mailing list
>     newbies at openstreetmap.org
>     http://lists.openstreetmap.org/listinfo/newbies
> 
> 

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