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<div class="moz-cite-prefix">Hi Renato.<br>
<br>
I think we had a similar discussions some time ago on one of the
mailing lists, but I don't find it currently.<br>
<br>
Some thoughts about it:<br>
<br>
1) possibilities to do sth. like that in OSM:<br>
Waze uses recorded data collections from real users. Provided that
these are real users and real traces, the speed estimation cannot
be manipulated by anyone, and can be calculated from a big
database by algorithms. This is not possible (or at least useful)
in osm: what is the average speed of a particular road? at which
time of the day? during holidays? at the weekend? by motorcycle or
truck? .....<br>
It might be possible to get an incredible complex tagging scheme
for that - but you need a huge amount of data to be added and
maintained to get useful data from it, so it's nothing for
by-hand-work of mappers IMHO.<br>
<br>
2) problems of manipulations:<br>
Living at a big street people often don't want to have more
traffic in front of their sleeping room window than necessary. A
legal speed limit is a fact - you can proove it's correctness and
lying about it is "more difficult" and detected as vandalism if
you keep wrong facts there.<br>
But an average speed is hard to measure, even harder to proove,
and dropping it by 20km/h may lead an important router to use a
different route - great; but there's no benefit to the user of
that router, because driving there at night or only outside the
rush hours he might have omitted the traffic jams, so the shorter
route in fact may have been much faster.<br>
<br>
On top of that these data often change fast with construction
sites, special events, holidays and much more.<br>
<br>
To summarize: I can imagine a system similar to waze collecting
traces and statistical data about average speed, and I can imagine
osm based routers that take this into account; but I don't think
it's possible/manageable to include this kind of data to the osm
database itself.<br>
<br>
regards<br>
Peter<br>
<br>
Am 26.08.2012 11:41, schrieb renato:<br>
</div>
<blockquote cite="mid:20120826114137.3e4dfd81@gmail.com" type="cite">
<pre wrap="">Hi, I've been trying out the Waze android GPS navigator and the one
feature I really find useful of it is that, in route calculation, it
doesn't use the road speed limit but rather the actual average speed on
that road, calculated from the data gathered from other users driving
those roads.
In a few days of use, I have discovered some new routes for places I
regularly go to, routes that are less known but certainly faster (avoid
traffic lights for example). Also the time estimates are way better
than Osmand (the only OSM navigator I actively used, but I plan on
trying other ones).
Could something like this be done in OSM? Has someone ever thought of
it? First thought would be an average_speed_by_car tag, that navigators
could use in calculating routes. Even better would be an automated way
of updating these tags by users using the navigator.
just curious to know thoughts about this idea,
cheers
renato
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