[OSM-newbies] R: Speed Limits

[Fabrizio Carrai]

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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