On 08/10/2011 16:42, Richard Fairhurst wrote:
In the UK, each road can only belong to one route (i.e. an unambiguous
ref= tag). There is no need for road route relations; the M5 motorway
is more easily defined as "all ways within the UK bounding box with
the tags highway=motorway* and ref=M5". Consequently we don't use road
route relations in the UK.
That's a bit of a sweeping statement!
I can think of several cases when they would be useful:
* there are lots of stretches of roads with (ostensibly) two UK numbers
(segment is shared between two routes)
* E-routes forming a network which overlays the national network
* well-known routes like "South Circular" which are made from bits of
lots of different roads
* roads such as the A1 which are part motorway with a different ref - an
"A1" relation could be continuous from London to Edinburgh
--colin
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