[OSM-talk] Divided roads proposal

[Anthony]

On Fri, Dec 4, 2009 at 10:03 AM, Morten Kjeldgaard <mok at bioxray.dk> wrote:
> In connection with a discussion we are currently having on the talk-dk
list
> about how to map cycleways I recently made a page on the wiki [0]. The
> purpose of the page is to explore the different problems/benefits you
> encounter when mapping cycleways as separate ways, vs. mapping them as
> tagged onto the road itself.
>
> These problems are similar to the current discussion on dual carriageways.

Yeah, they're pretty much exactly the same.

At least, here in Florida.  Bicycles are allowed to use a dedicated bike
lane, or, in certain situations such as when preparing to make a turn, can
use the regular roadway.  So using two separate ways doesn't really convey
the reality of the situation.  We really have a (for example) three lane
highway, with two lanes for cars and bicycles, and one lane for bicycles
only.  There is nothing but a thick white line separating the bike lane from
the other lanes, so using more than one way is inappropriate.

Basically, we need to find a way to map lanes, and we need a way to connect
those lanes along ways and not just at individual nodes.  The latest
strategy I've been thinking about is to use areas.  Areas can be connected
together along ways, and not just at individual nodes, so it's almost
perfect.  Perfect until you try to add a oneway tag.

I'll have to draw something up...

1------------------------------2
|                                                            |
3------------------------------4
|                                                            |
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5------------------------------6
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7------------------------------8
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9------------------------------0

<way id=34>
 <nd ref=3>
 <nd ref=4>
 <tag k=divider v=line>
 <tag k=line v=lane_change_allowed> (or v=lane_change_prohibited, or
v=change_with_extra_care, etc.)
</way>

<relation id=1234>
 <member type=way ref=12 role=left>
 <member type=way ref=13 role=outer>
 <member type=way ref=34 role=right>
 <member type=way ref=24 role=outer>
 <tag k=type v=directed_area>
 <tag k=highway v=cycleway>
 <tag k=oneway v=yes>
</relation>
<relation id=3456>
 <member type=way ref=34 role=left>
 <member type=way ref=35 role=outer>
 <member type=way ref=56 role=right>
 <member type=way ref=46 role=outer>
 <tag k=type v=directed_area>
 <tag k=highway v=secondary>
 <tag k=oneway v=yes>
</relation>
<relation id=5678>
 <member type=way ref=56 role=outer>
 <member type=way ref=57 role=outer>
 <member type=way ref=78 role=outer>
 <member type=way ref=68 role=outer>
 <tag k=type v=multipolygon>
 <tag k=barrier v=traffic_island>
 <tag k=surface v=grass>
 <tag k=foot v=yes>
</relation>
<relation id=7890>
 <member type=way ref=90 role=left>
 <member type=way ref=79 role=outer>
 <member type=way ref=78 role=right>
 <member type=way ref=80 role=outer>
 <tag k=type v=directed_area>
 <tag k=highway v=secondary>
 <tag k=oneway v=yes>
</relation>

Editor support would obviously be helpful, but isn't an absolute
requirement.
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