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<div class="moz-cite-prefix">On 2016-09-13 18:21, Marc Gemis wrote:<br>
</div>
<blockquote
cite="mid:CAJKJX-QxFvtPk98BOGtqPkH2tSzeHod9b9_4TNVNTzBX=GH43A@mail.gmail.com"
type="cite">
<pre wrap="">Hallo,
I was contacted by a mapper from Germany with whom I worked on turn:lanes.
He has to following question, can someone with local knowledge inform
us about the road classifications ? I have the impression a lot of
streets are indeed residential. Feel free to reply in French, I'll
translate it to English for him.
[snipped]
Now I want ask you about another problem.
Coming from here
<a class="moz-txt-link-freetext" href="http://forum.mapfactor.com/discussion/comment/13515#Comment_13515">http://forum.mapfactor.com/discussion/comment/13515#Comment_13515</a>
I checked Liege to find out the mapping of roads there:
<a class="moz-txt-link-freetext" href="http://overpass-turbo.eu/s/imn">http://overpass-turbo.eu/s/imn</a>
My guess is, that unclassified is used wrong there and that is the
reason for strange routings. My opinion is that unclassified as the
lowest kind of connecting roads do not end at city borders and have or
need common connection to same or higher class inside of towns or
villages. For me routers should avoid residentials and lower as much
as possible. Do you have any idea to check and correct this in Liege
to make routing better?
If there are any questions, please ask.
Regards
Michael aka hurdygurdyman
</pre>
</blockquote>
In order to produce good routing using the <b>main</b> roads (1),
...<br>
why not adopt in OSM the <a
href="https://fr.viamichelin.be/web/Cartes-plans/Carte_plan-Liege-_-Liege-Belgique?">same
classification as Michelin</a> (2)?<br>
They should know something about routing, shouldn't they?<br>
<br>
<table border="1" cellpadding="2" cellspacing="2">
<tbody>
<tr>
<td valign="top">Michelin<br>
</td>
<td bgcolor="#ff0000" valign="top"><br>
</td>
<td colspan="2" rowspan="1" bgcolor="#ffcc00" valign="top"><br>
</td>
<td colspan="2" rowspan="1" valign="top"><br>
</td>
</tr>
<tr>
<td valign="top">BE ID/type<br>
</td>
<td valign="top">Nxx<br>
</td>
<td valign="top">Nxxx<br>
</td>
<td valign="top">other<br>
</td>
<td valign="top">many houses<br>
</td>
<td valign="top">rare houses<br>
</td>
</tr>
<tr>
<td valign="top">OSM<br>
</td>
<td valign="top">primary<br>
</td>
<td valign="top">secondary<br>
</td>
<td valign="top">tertiary<br>
</td>
<td valign="top">residential<br>
</td>
<td valign="top">unclassified<br>
</td>
</tr>
</tbody>
</table>
<br>
Inside town, the main advantage is that streets are then classified
as either secondary/tertiary or residential/unclassified <br>
according to whether they should be used or not for routes from town
place to place.<br>
Please note that when a street is promoted to tertiary status, the
fact that it contains houses gets disregarded<br>
(and hence I wonder if it's a good idea to consider houses for road
classification rather than using an additional residential attribute
(yes, I know it's the way "we" do it)).<br>
<br>
I am willing to explain JOSM users how to compare OSM and Michelin
easily.<br>
Please send me a <b>private </b><b>reply</b> to the next message
"Michelin info" to get it.<br>
I would do a part of Liège myself if it's organized by someone
distributing the tasks.<br>
<br>
Cheers
<br>
<br>
<table>
<tbody>
<tr>
<td>André.</td>
</tr>
</tbody>
</table>
<br>
(1) several de-contributors claim loudly that OSM routing is an
every contributors' hoax; I tend to agree with them for routing
finer than main roads given the complexity of making a no-turn
relation, the general misunderstanding of access restriction rules
("bicycle=yes" alone), etc.; but I hate the "we don't do it like
that" answers without any constructive remark towards my goal when I
suggest improvements. The "dedicated" subject alone makes whole
chapters just because the "dedicated" concept is not an (already
existing) access restriction but a reason for one ("but "we" do it
like that").<br>
<br>
(2) I suppose that Michelin doesn't mind just that since they
updated OSM themselves <a
href="http://www.liberation.fr/ecrans/2013/06/12/michelin-se-donne-carte-blanche-avec-openstreetmap_960363">in
their 2012 experiment</a>.<br>
<br>
<br>
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