<div dir="ltr"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">These are only OS's opinion, not a legal status, so there's no need to<br>follow them slavishly if our own on-the-ground observation clearly<br>points to something different. But they are open data, so we can use<br>them, and they do form a useful guide when local observation is<br>potentially inconclusive or ambiguous.<br></blockquote><div><br></div><div>Thanks - what about the thorny issue of what residents *want* their road to be, rather than how drivers choose to use it? Does a regular rat running problem change the status of a road?</div><div> </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 19 Aug 2021 at 19:07, Mark Goodge <<a href="mailto:mark@good-stuff.co.uk">mark@good-stuff.co.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>
On 19/08/2021 18:35, Colin Smale wrote:<br>
> There is a legal distinction between Tertiary and Unclassified; the <br>
> responsible highway authority decides, and records it in their <br>
> definitive list of streets. A tertiary road has a number, usually <br>
> prefixed by a 'C', which is not usually publicised.<br>
> <br>
> Looking at Streetview it looks like Alexandria Road has a function for <br>
> through traffic, so IMHO it should not be tagged as residential. Whether <br>
> it's tertiary or unclassified depends formally on the HA as mentioned <br>
> above. But one thing is certain: the mere presence of houses along this <br>
> road is not sufficient to class it as residential.<br>
<br>
OS OpenRoads has a "road function" column which indicates the usage of <br>
the road (as distinct from the "road classification" column which shows <br>
the legal status. The possible values of "road function" are:<br>
<br>
Motorway<br>
A Road<br>
B Road<br>
Minor Road<br>
Local Road<br>
Local Access Road<br>
Secondary Access Road<br>
Restricted Local Access Road<br>
<br>
The top three obviously reflect the legal status of classified roads <br>
(and, if that value is present, is always the same as the "road <br>
classification" column), but the rest are an "on the ground" observation <br>
of how the road is actually used in practice. Broadly speaking, "Minor <br>
Road" corresponds to OSM's "tertiary", and, in urban areas, "Local Road" <br>
corresponds to OSM's "residential".<br>
<br>
These are only OS's opinion, not a legal status, so there's no need to <br>
follow them slavishly if our own on-the-ground observation clearly <br>
points to something different. But they are open data, so we can use <br>
them, and they do form a useful guide when local observation is <br>
potentially inconclusive or ambiguous.<br>
<br>
In this particular case, Alexandria Road in Ealing is labelled "Minor <br>
Road" by OS, so I would be inclined to agree that "tertiary" is the best <br>
option for OSM.<br>
<br>
Mark<br>
<br>
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</blockquote></div>