[Talk-il] conventions for tagging roads

[Yuri Magrisso]

> 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.
>

Yeah.. I kind of took a hint from there :)
When we focus on Israel, though, we can set more clear / narrow
requirements.


>
> highway=trunk
> ===========
> *Important roads that aren't motorways. Typically maintained by central,
> not local government.
> Need not necessarily be a divided highway. In the UK, many 2digit "A"
> roads (eg A34) were formally designated Trunk roads although that
> definition is no longer absolute... *
>
> 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.
>

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.


>
>
> On Fri, Oct 17, 2008 at 3:53 PM, Yuri Magrisso <yumariso at gmail.com> wrote:
>
>> Hi,
>>
>> I started discussing with Baruch a new convention for tagging roads. I'll
>> rehash things to have it all in one place -
>>
>> 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:
>>
>> Intercity roads
>>
>> 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).
>>
>> 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.
>>
>> 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.
>> The tag "highway=secondary" should be used on roads that have two clearly
>> separated lanes, one for each direction.
>>
>> 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.
>>
>>
>> City roads
>>
>> 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.
>>
>> 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.
>>
>> 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.
>>
>> The tag "highway=tertiary" should be used on roads with speed limit of 50
>> km/h, that have two lanes in each direction.
>>
>> 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".
>>
>> 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.
>>
>> What do you think?
>> Yuri
>>
>>
>>>
>>> Hi Yuri,
>>>
>>> Baruch has sent you a message through OpenStreetMap with the subject "Re:
>>> road conventions":
>>>
>>> ==
>>> Hi,
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> Baruch
>>>
>>> On Thu Oct 09 14:53:00 +0100 2008 Yuri wrote:
>>>
>>> > Hi Baruch,
>>> >
>>> > 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.
>>> >
>>> > 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.
>>> > 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.
>>> >
>>> > 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.
>>> >
>>> > You can email me at yumariso at gmail dot com.
>>> >
>>> > Best regards,
>>> > Yuri
>>> ==
>>>
>>>
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>
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