On 02/11/13 18:47, Jonathan wrote:
I'm not clear with the distinction of a Trunk road in the UK. The wiki
suggests a trunk road is "high performance roads that don't meet the
requirement for highway
<http://wiki.openstreetmap.org/wiki/Key:highway>=motorway
<http://wiki.openstreetmap.org/wiki/Tag:highway%3Dmotorway>" which to me
would suggest an A road that is a dual carriageway. Further on in the
wiki it says that any A road in the UK signed with "Green" signs is a
"Trunk" road.
I know of many "Green" "A" roads that aren't much more than country
lanes, they are definitely not "high performance" and I don't feel they
should be "Trunk" roads, I feel they should be "Primary" roads.
It's really very simple, and has been discussed here many, many times
before and I'm sure there are multiple pages on the wiki covering it.
First, forget the question of which roads are formally designated as
trunk roads by the Department for Transport (which is not very many
these days).
Second, understand that there is something called the Primary Route
Network defined by DfT which covers those A roads connecting specific
major towns. Those are the A roads with the green signs, and are what we
tag as highway=trunk. Other A roads are highway=primary.
In many cases those will be major roads, often ex trunk roads, but in
more rural areas like the highlands they might look more like a B road
does in other parts of the country. That is irrelevant though.
In the UK it is really only residential/unclassified/tertiary where you
need to make a judgement call. Everything else has a well defined mapping:
Motorways => highway=motorway
Green Signed A Roads => highway=trunk
White Signed A Roads => highway=primary
B Roads => highway=secondary
Hopefully that will explain everything ;-)
Tom
--
Tom Hughes (t...@compton.nu)
http://compton.nu/
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