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<p>Hello,<br>
</p>
<p>Following a number of complaints to the Data Working Group I've
changed these back (those that hadn't already been reverted -
several mappers have changed some back already) in
<a class="moz-txt-link-freetext" href="https://www.openstreetmap.org/changeset/111266298">https://www.openstreetmap.org/changeset/111266298</a> and also did
some manual tidying afterwards (see
<a class="moz-txt-link-freetext" href="https://www.openstreetmap.org/user/SomeoneElse/history">https://www.openstreetmap.org/user/SomeoneElse/history</a> from
111265277 onwards). Some of that manual tidying (e.g. gaps in
relations) was probably fixing issues that already existed prior
to any of these changes.<br>
<br>
I think that things should be back as they were before now, but if
anyone sees any remaining issues please let us know.</p>
<p>Best Regards,</p>
<p>Andy (with a Data Working Group hat on)</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 14/09/2021 17:50, Barry McGuire
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CALtKTKmq5CcS9+QVbB2OoFQfzVkKWE53fot2PF8nU=V8_qFCSQ@mail.gmail.com">
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<div dir="ltr">It's strange that the highway=primary tag is used
for non-primary routes, and it seems like an historical accident
caused by people assuming trunk roads and primary routes are the
same thing, when they're not (usually). Trunk roads form part of
the strategic road network and are managed by a highways
authority (e.g. "National Highways" formerly Highways England,
and their relevant counterparts in Wales and Scotland). Primary
routes are selected routes between primary destinations. Other A
roads are roads connecting important (although not necessarily
primary) destinations.<br>
<br>
The Scottish OSM maps already have their strategic routes as
trunk, with all other A roads as primary, which more closely
follows OSM terminology.
<div><br>
In Wales the vast majority of their primary routes are also
strategic (trunk) routes, but not all of them.<br>
<br>
In England there is a proliferation of roads at the OSM
'trunk' level which isn't seen in most other countries,
especially not in town and city centres. Many of the roads are
currently tagged as 'trunk' because they're primary routes but
they're single carriageway, when OSM usage indicates 'trunk'
roads are 'high performance or high importance roads that
don't meet the requirement for a motorway'. This implies they
should be mostly dual carriageway and high importance, yet
fall short of motorway classification (e.g. A1, A11, A12, A14,
A19, A2, A20, A23, A27, A30, A31, A34, A35, A38, A4, A47,
A66). This further implies that using the 'strategic route'
designation for the 'trunk' tag would be more appropriate than
using the 'primary route' designation.<br>
<br>
Proposal to align UK road types with OSM types as follows:<br>
OSM Motorway = UK Motorway <br>
OSM Trunk = UK strategic routes, known as 'trunk' routes
(Currently UK primary A roads)<br>
OSM Primary = All other A roads (Currently UK non-primary A
roads)<br>
OSM Secondary = B roads<br>
<br>
Strategic route designations can be found by using data
released under OGLv3, just like the NaPTAN data.<br>
<br>
There are a few edge cases to consider:-<br>
* B5093 Mosley Road, Fallowfield, Manchester is designated as
a primary route and is also a B road. Resolved by changing to
strategic = trunk.<br>
* B6261 at Shap, Cumbria linking A6 to M6 is designated as a
primary route and is also a B road. Resolved by changing to
strategic = trunk.<br>
* A505 and A602 between Stevenage and Luton are not primary
routes despite linking two primary destinations. The proposal
would place this road on the same level as all other A roads,
by abolishing the distinction between 'primary' and
'non-primary' A roads on OSM.<br>
<br>
England-Scotland border (West to East) - 2 changes at the
border (A7 and A68)<br>
* M6 Motorway<br>
* A7 primary route (Scotland strategic, England non-strategic)<br>
* A68 primary route (Scotland strategic, England
non-strategic)<br>
* A697 primary route (Scotland non-strategic, England
non-strategic)<br>
* A1 primary route (Scotland strategic, England strategic)<br>
<br>
England-Wales border (North to South) - 1 change at the border
(A465)<br>
* A494 primary (Wales strategic, England strategic)<br>
* A55 primary
(Wales strategic, England strategic)<br>
* A483 primary
(Wales strategic, England strategic)<br>
* A535 primary
(Wales non-strategic, England non-strategic)<br>
* A5 primary
(Wales strategic, England strategic)<br>
* A483
primary
(Wales strategic, England strategic)<br>
* A458 primary
(Wales strategic, England strategic)<br>
* A44
primary
(Wales non-strategic, England non-strategic)<br>
* A438
primary
(Wales non-strategic, England non-strategic)<br>
* A465 primary (Wales strategic, England non-strategic)<br>
* A40 primary
(Wales strategic, England strategic)<br>
* A48 primary (Wales non-strategic, England non-strategic)<br>
* M48 motorway<br>
* M4 motorway<br>
<br>
Changes of designation at borders are not unusual, so I'm not
concerned about that.<br>
<br>
The only real downsides to this proposal are the work involved
(which shouldn't really take too long) and the loss of
information about which roads are designed as primary - which
is a bit of a false distinction in any case as primary routes
do not indicate the actual standard or importance of the road,
just that they link two 'primary locations'. Note that
'primary' locations do not mean they they're actually
important locations, just that they're useful for navigation
purposes (e.g. Scotch Corner as a junction, and Stevenage for
itself and the towns around it). The use of those locations
for navigation purposes made sense in the 60s but with satnavs
etc the standard and relative importance of the road should
take priority on maps.<br>
<br>
Thanks,<br>
Barry<br>
<br>
</div>
</div>
<br>
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