<div dir="ltr"><br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr">I've read some of the map features descriptions again, regarding highways, and it seems to be that you have the same intuition as they intended. The description there does not rely on the state classification.<br>
</div></blockquote><div><br>Yeah.. I kind of took a hint from there :) <br>When we focus on Israel, though, we can set more clear / narrow requirements. <br> <br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div dir="ltr"><br>highway=trunk<br>===========<br><i>Important roads that aren't motorways. Typically maintained by central, not local government.<br>Need not necessarily be a divided highway. <b>In the UK, many
2digit "A" roads</b> (eg A34) were formally designated Trunk roads although
that definition is no longer absolute...
</i><br><br>There will probably be some correlation between state road classification and the requirements for being an osm motorway/trunk/etc, but it shouldn't be THE criteria.</div></blockquote><div><br>Now that you say that, I realize that we can summarize the requirements for "highway=motorway" as roads classified as "highway" by the state. In that case I think there is a 100% correlation. I am not aware of any other state classifications that represent road quality, though. Road numbers don't seem to be based on road quality - there are many double digit roads that have a single lane and many with two lanes. <br>
</div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr"><br><div class="gmail_quote"><div><div></div><div class="Wj3C7c"><br>On Fri, Oct 17, 2008 at 3:53 PM, Yuri Magrisso <span dir="ltr"><<a href="mailto:yumariso@gmail.com" target="_blank">yumariso@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="Wj3C7c"><div dir="ltr">Hi,<br>
<br>I started discussing with Baruch a new convention for tagging roads. I'll rehash things to have it all in one place - <br><br>Currently the convention for tagging roads is based on the road numbers. A more reasonable approach would be to tag roads based on their quality, because then the coloring of the road would provide another useful bit of information. I think we can judge the road quality by the speed limit, number of lanes, types of intersections and their frequency. Here's a first version for a conventions that follow this principle:<br>
<br>Intercity roads<br><br>The tag "highway=motorway" should be used on roads that have a speed limit of 100 km/h or more, have at least two lanes in each direction and have multi-level intersections (no traffic lights or unregulated intersections). (I think traffic authorities give a speed limit of 100 or more only to roads that meet the other two conditions, so they may be redundant).<br>
<br>
The tag "highway=trunk" should be used on roads that have a speed limit of 90 km/h, have at least two lanes in each direction and have mostly traffic-light or multi-level intersections. <br><br>The tag "highway=primary" should be used on roads that have a speed limit of 90 km/h, have one lane in each direction and a clearly marked side-lane.<div class="gmail_quote">
<div><br>The tag "highway=secondary" should be used on roads that have two clearly separated lanes, one for each direction.<br><br>The tag "highway=tertiary" should be used on roads that do not meet any of the above requirement sets (have only one lane), but at-least have asphalt layer.<br>
<br><br>City roads<br><br>Inside a city the "motorway" and "trunk" tags can be used if the intercity conditions are met, or if they are a continuation of a road having the same tag and the speed limit difference is no more than 10 km/h.<br>
<br>The tag "highway=primary" should be used for roads that have a speed limit of 60 km/h or more, have at least two lanes in each direction and have mostly traffic-light crossroads, with no unregulated crossroads that cross the lanes in both directions.<br>
<br>The tag "highway=secondary" should be used on roads that have a speed limit of 60 km/h or more, and have at least two lanes in each direction.<br><br>The tag "highway=tertiary" should be used on roads with speed limit of 50 km/h, that have two lanes in each direction.<br>
<br>Roads with one lane in each direction should be tagged as "highway=residential". Roads on which pedestrians are given right should be tagged as "highway=living_street".<br><br>City roads can be tagged as "primary" or "secondary" based on how central they are for the city even if they do not meet all the requirements. If you are not a resident of the city you can probably judge the importance of a road by the presence of important commercial or administrative buildings like a mall or a municipality. <br>
<br>What do you think?<br>Yuri<br> <br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
Hi Yuri,<br>
<br>
Baruch has sent you a message through OpenStreetMap with the subject "Re: road conventions":<br>
<br>
==<br>
Hi,<br>
<br>I agree about that, the road numbers are only good as a first
degree approximation. I did notice road number 3 which is fine but not
motorway quality and it was a worse road before that.<br>
<br>
If you can whip up a proposal we can flesh it out and offer it on
talk-il. Better yet, email it to talk-il so that everyone can
participate in the discussion.<br>
<br>
Baruch<br>
<br>
On Thu Oct 09 14:53:00 +0100 2008 Yuri wrote:<br>
<br>
> Hi Baruch,<br>
><br>
> I have a few suggestions on how to tag roads. The basic idea is
that the road type should represent the road quality so to say. If we
tag roads according to their numbering we are not giving any additional
useful information.<br>
><br>
> I think that the primary factors for choosing the road type should
be the speed limit, the number of lanes and the type of intersections
on the road.<br>
> For example to qualify a road as 'motorway' it should have a speed
limit of 100 or above, have at least two lanes and use multi-level
intersections (no traffic lights). For trunk roads the speed limit
should be 90, again at least two lanes, but you can have traffic light
intersections.<br>
><br>
> If you like the idea, we can ping-pong a more detailed convention
- for intercity roads it is fairly easy. For city roads it will be more
problematic, but we can set up some guidelines there too.<br>
><br>
> You can email me at yumariso at gmail dot com.<br>
><br>
> Best regards,<br>
> Yuri<br>
==<br>
<br>
</blockquote></div></div>
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