I don't see why this discussion is so complicated.<br>OSM tags are based on British English terms for historic reasons.<br>In that contest there is a clean-cut distinction between a roundabout and a mini-roundabout:<br>
Quote from Wikipedia: "Mini-roundabouts can be a painted circle or a low dome but must be fully traversable." (from: <a href="https://en.wikipedia.org/wiki/Mini_roundabout#Mini-roundabouts">https://en.wikipedia.org/wiki/Mini_roundabout#Mini-roundabouts</a>)<br>
A small round-about, that has an obstacle in the middle (example: <a href="https://en.wikipedia.org/wiki/File:Pacionfi.JPG">https://en.wikipedia.org/wiki/File:Pacionfi.JPG</a>), is not a mini_roundabout, but a roundabout, albeit a small one.<br>
<br>Volker<br>(Padova, Itlay)<br><br><div class="gmail_quote">On 9 May 2012 04:10, Steve Bennett <span dir="ltr"><<a href="mailto:stevagewp@gmail.com" target="_blank">stevagewp@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
The problems with this tag are the same with most tags. The history<br>
goes something like:<br>
<br>
1) The original creator has a very specific real-world object in mind:<br>
painted roundabout patterns on intersections in their local area<br>
2) Other people in the local area recognise this real-world concept<br>
and also apply the tag.<br>
3) Soon it makes its way into editors, renderers etc.<br>
4) People in other parts of the world see this tag and think they should use it.<br>
5) They deduce what they think are the salient features: it's small,<br>
it's painted, you can drive over it physically, you can drive over it<br>
legally...<br>
6) Different kinds of real world objects get mapped with the tag, that<br>
include some, but not all of the above salient features (eg,<br>
roundabouts you can drive over, but are physically raised; or<br>
roundabouts that are just painted but legally you must not drive over<br>
them...)<br>
7) People notice the contradiction between the (poor) documentation<br>
and current practice, and try to change it<br>
8) People who used the tag in step 6 object, because now it doesn't<br>
match the way *they* use the tag.<br>
<br>
I'm not sure what the moral of the story here is, except that whoever<br>
creates the tag originally has the easiest job, because the tags match<br>
up beautifully with their local environment. (See highway=footway,<br>
highway=cycleway, highway=bridleway, which actually appear as words on<br>
signs in the UK - but compare the difficulty of applying them to<br>
somewhere like Australia)<br>
<br>
I kind of think the only real solution is to have a fairly loose<br>
coupling between regions about the definition of tags, and tight<br>
cohesion within regions. So highway=mini_roundabout should universally<br>
mean something like "small roundabout you could probably drive over",<br>
but within a single region (either a country, or perhaps smaller), it<br>
should have a much stricter definition, depending on local road laws,<br>
building practices etc.<br>
<br>
(We do this already with tags like highway=motorway and<br>
highway=cycleway, but we could be much more systematic.)<br>
<span class="HOEnZb"><font color="#888888"><br>
Steve<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
On Wed, May 9, 2012 at 2:18 AM, Erik Johansson <<a href="mailto:erjohan@gmail.com">erjohan@gmail.com</a>> wrote:<br>
> On Mon, May 7, 2012 at 11:54 PM, Philip Barnes <<a href="mailto:phil@trigpoint.me.uk">phil@trigpoint.me.uk</a>> wrote:<br>
>> On Mon, 2012-05-07 at 13:30 -0700, Paul Johnson wrote:<br>
>>> On Mon, May 7, 2012 at 1:28 PM, Nathan Mills <<a href="mailto:nathan@nwacg.net">nathan@nwacg.net</a>> wrote:<br>
>>> > So this is not/should not be a mini_roundabout? It seems a little silly to<br>
>>> > call it anything else, since the city just dug a hole in the center of the<br>
>>> > existing intersection, built a circular curb, and planted a tree:<br>
>>> ><br>
>>> > <a href="http://g.co/maps/e2gsv" target="_blank">http://g.co/maps/e2gsv</a><br>
>>> ><br>
>>> > What about this one? Also a full on roundabout?<br>
>>> ><br>
>>> > <a href="http://g.co/maps/d6n74" target="_blank">http://g.co/maps/d6n74</a><br>
>>> ><br>
>>> > This looks more like a roundabout to me:<br>
>>> ><br>
>>> > <a href="http://g.co/maps/hnbp9" target="_blank">http://g.co/maps/hnbp9</a><br>
>>><br>
>>> All three are roundabouts, yes.<br>
>> All 3 are roundabouts, none of them a mini-roundabouts.<br>
>><br>
>> The point of a mini-roundabout is that they can be driven over, hence<br>
>> whilst cars are supposed to go around them and many are 'speed-hump<br>
>> raised' to encourage this behaviour. Trucks can pass over them as many<br>
>> are in places where a truck cannot get around otherwise.<br>
>><br>
>> The first 2 should be mini-roundabouts, as a truck is likely to have<br>
>> serious issues with them. I cannot imagine that tree will last too long.<br>
>><br>
>> This is a mini-roundabout, which you can see is raised slightly<br>
>> <a href="http://g.co/maps/hm49m" target="_blank">http://g.co/maps/hm49m</a><br>
>> Actually its part of the magic roundabout, which is a roundabout you can<br>
>> go around in either direction, and at each intersection there is a<br>
>> mini-roundabout. On osm its here, <a href="http://osm.org/go/eumbs5ZIw--" target="_blank">http://osm.org/go/eumbs5ZIw--</a><br>
>><br>
>> Phil<br>
><br>
><br>
> But Nathan does have a point, mini-roundabouts are not a specifically<br>
> good name, and the current docs will only make more people tag small<br>
> roundabouts as highway=mini_roundabouts..<br>
><br>
><br>
><br>
> --<br>
> /emj<br>
><br>
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