[Talk-GB] "Trunk" vs "green-sign" routes in the UK

Tom Hughes tom at compton.nu
Mon Apr 22 13:57:25 UTC 2013

On 22/04/13 14:44, David Fisher wrote:

> I've noticed a couple of roads in the UK being downgraded in OSM from
> "trunk" to "primary" on the basis that they are not "trunk" in the
> County Council / DfT maintenance sense.  They are, however, "green-sign"
> primary routes and are clearly of greater importance than your average
> "white-sign" route.  The ones I've noticed are the A354
> (Salisbury-Blandford) and A22 (Greater London boundary to E Grinstead).
> Strictly speaking these changes are correct, as "trunk" in the UK
> implies being run by the DfT rather than local councils (N.B. a large
> number of former trunk routes have been devolved in the past 10 or 20
> years).  But the OSM Wiki says to use the "trunk" tag for "primary A
> road (green signs)", and this would certainly make more sense from the
> road-user perspective.  Is there a consensus on this?  If not, might it
> be a good idea to introduce a new tag signifying a UK "green-sign"
> route, and for these to be rendered as such in Mapnik (i.e. in green,
> the same as "trunk" routes)?

Yes, there has been a consensus for at least the last six and a bit 
years now that "trunk" in the OSM sense means green signed primary A 
road and "primary" means white signed secondary A road.

Which is why the wiki says what it does.


Tom Hughes (tom at compton.nu)

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