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<div class="moz-cite-prefix">I added a table of statistics to
<a class="moz-txt-link-rfc2396E" href="https://wiki.openstreetmap.org/wiki/Route_directions#Statistics"><https://wiki.openstreetmap.org/wiki/Route_directions#Statistics></a>
with links to Overpass queries that you can customize for the
route network (or cycle_network) you’re interested in.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">As of today, about three quarters of
Interstate way mileage is covered by either method of tagging
cardinal directions. Directional roles in bidirectional route
relations cover 40% more distance than unidirectional route
relations, but only 63% of the overall distance of bidirectional
route relations.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">About a quarter of U.S. Route way
mileage is covered by either method. Directional roles cover more
than twice the distance of unidirectional route relations, but
only 20% of the overall distance of bidirectional route relations.
It’s a huge gap that probably hasn’t changed all that much since
2013.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">California has always used
unidirectional route relations pretty consistently for divided
highways, but routes along surface streets are largely untagged
with directions, as in many states.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Vào lúc 12:46 2021-07-31, Tod Fitch đã
viết:<br>
</div>
<blockquote type="cite"
cite="mid:DA43CD28-9A16-4FB0-AA2A-A49F5E9274A0@fitchfamily.org">I
don’t have a good feeling about how the whole country is, but all
the freeways I have looked at in California have three relations
(1 master and one each for the cardinal direction). In my area the
US routes are mostly but not all using three relation scheme as
are a few California state routes. At least for my editing style
using JOSM, I much prefer the super/sub relation scheme as I find
it easier to fix things when broken.
<div class=""><br class="">
</div>
<div class="">—Tod<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Jul 31, 2021, at 6:19 AM, Clifford Snow
<<a href="mailto:clifford@snowandsnow.us"
class="moz-txt-link-freetext" moz-do-not-send="true">clifford@snowandsnow.us</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="ltr" class="">Do you know what portion of the
Interstate system has been mapped with route directions?
What about US routes?
<div class=""><br class="">
</div>
<div class="">Clifford</div>
</div>
<br class="">
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jul 30, 2021
at 11:37 PM Minh Nguyen <<a
href="mailto:minh@nguyen.cincinnati.oh.us"
class="moz-txt-link-freetext" moz-do-not-send="true">minh@nguyen.cincinnati.oh.us</a>>
wrote:<br class="">
</div>
<blockquote class="gmail_quote">The article has been
rewritten according to the draft and renamed to <br
class="">
reflect signage and tagging practices in Canada and
New Zealand as well:<br class="">
<br class="">
<a
href="https://wiki.openstreetmap.org/wiki/Route_directions"
rel="noreferrer" target="_blank"
class="moz-txt-link-freetext" moz-do-not-send="true">https://wiki.openstreetmap.org/wiki/Route_directions</a><br
class="">
<br class="">
Vào lúc 17:55 2021-07-24, Minh Nguyen đã viết:<br
class="">
> Back in 2013, a discussion on this list [1] led
to a wiki article <br class="">
> documenting how to indicate the cardinal
direction along a route, such <br class="">
> as the "north" in northbound I-75. [2] I've
drafted a rewrite of this <br class="">
> article at [3] and would like to get the
community's feedback on it <br class="">
> before touching the original, which has often
come up in discussion. The <br class="">
> rewrite attempts to clearly explain route
directions for both domestic <br class="">
> and international audiences. These days, overseas
mappers are very <br class="">
> active in navigation mapping, and route
directions are also relevant to <br class="">
> some non-English-speaking regions.<br class="">
> <br class="">
> According to the original documentation, setting
relation roles to <br class="">
> cardinal directions is preferred over creating a
separate relation for <br class="">
> each direction and setting direction=* to the
cardinal direction (and <br class="">
> joining the relations in a superrelation). The
rewrite reverses this <br class="">
> guidance, placing more emphasis on subrelations
and superrelations than <br class="">
> relation roles.<br class="">
> <br class="">
> The directional roles have had the advantage of
being easier to <br class="">
> introduce than superrelations, especially for
routes that only <br class="">
> occasionally run along divided highways. That was
important early on, <br class="">
> when route relations were first being built out.
However, it has tended <br class="">
> to result in routes that are only partly tagged
with cardinal <br class="">
> directions, requiring data consumers to infer the
cardinal direction <br class="">
> along ways with forward, backward, or unset
roles. Additionally, editors <br class="">
> and quality assurance tools have not added
specialized support for these <br class="">
> roles as they have for forward/backward, so
existing coverage has been <br class="">
> fragile.<br class="">
> <br class="">
> Although subrelations and superrelations are
initially more difficult to <br class="">
> create, they are easier to maintain in the long
run and are already <br class="">
> well-established for major road routes as well as
public transportation <br class="">
> routes. I see them as part of a natural
progression in OSM towards <br class="">
> greater detail, coverage, and structure.<br
class="">
> <br class="">
> This would only be a rewrite of documentation.
I'm not proposing an <br class="">
> effort to systematically restructure existing
route relations into <br class="">
> subrelations and superrelations. However, this
documentation would <br class="">
> better support mappers who are interested in
carrying out such <br class="">
> improvements themselves. Thanks for your
attention.<br class="">
> <br class="">
> [1] <br class="">
> <a
href="https://lists.openstreetmap.org/pipermail/talk-us/2013-November/thread.html#12165"
rel="noreferrer" target="_blank"
class="moz-txt-link-freetext" moz-do-not-send="true">https://lists.openstreetmap.org/pipermail/talk-us/2013-November/thread.html#12165</a>
<br class="">
> <br class="">
> [2] <br class="">
> <a
href="https://wiki.openstreetmap.org/wiki/Highway_Directions_In_The_United_States"
rel="noreferrer" target="_blank"
class="moz-txt-link-freetext" moz-do-not-send="true">https://wiki.openstreetmap.org/wiki/Highway_Directions_In_The_United_States</a><br
class="">
> [3] <a
href="https://wiki.openstreetmap.org/wiki/User:Minh_Nguyen/Route_directions"
rel="noreferrer" target="_blank"
class="moz-txt-link-freetext" moz-do-not-send="true">https://wiki.openstreetmap.org/wiki/User:Minh_Nguyen/Route_directions</a><br
class="">
<br class="">
-- <br class="">
<a href="mailto:minh@nguyen.cincinnati.oh.us"
target="_blank" class="moz-txt-link-freetext"
moz-do-not-send="true">minh@nguyen.cincinnati.oh.us</a><br
class="">
<br class="">
<br class="">
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class="">
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class="moz-txt-link-freetext" moz-do-not-send="true">https://lists.openstreetmap.org/listinfo/talk-us</a><br
class="">
</blockquote>
</div>
<br class="">
<div class=""><br class="">
</div>
-- <br class="">
<div dir="ltr" class="gmail_signature">
<div dir="ltr" class="">
<div class="">
<div dir="ltr" class="">
<div class="">
<div dir="ltr" class="">
<div class="">@osm_washington<br class="">
</div>
<div class=""><a
href="https://www.snowandsnow.us/"
target="_blank" class=""
moz-do-not-send="true">www.snowandsnow.us</a></div>
<div class="">OpenStreetMap: Maps with a human
touch</div>
</div>
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</div>
</blockquote>
</div>
<br class="">
</div>
</blockquote>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Minh Nguyen <a class="moz-txt-link-rfc2396E" href="mailto:minh@nguyen.cincinnati.oh.us"><minh@nguyen.cincinnati.oh.us></a></pre>
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