[Tagging] Bridges and layers

Anthony osm at inbox.org
Tue Jul 27 16:14:09 BST 2010

On Tue, Jul 27, 2010 at 11:06 AM, David Earl <david at frankieandshadow.com> wrote:
> On 27/07/2010 15:58, Anthony wrote:
>> On Tue, Jul 27, 2010 at 6:27 AM, David Earl<david at frankieandshadow.com>
>>  wrote:
>>> You cannot tell from our model, without additional information such as a
>>> relation, whether two parallel ways are part of a dual carriageway or
>>> just
>>> parallel roads.
>> What's the difference?  Just whether or not they have the same name?
> That's not sufficient. You'd have to do some kind of heuristic test to see
> whether they were approximately parallel as well

You said they were parallel.  Twice in fact.

> But you're right to some extent, so I revise my statement: "You cannot
> *easily and accurately* tell from our model..."

Personally I think the name of the road should be part of a relation
which consists of all ways which make the road, not tagged on every
single way individually.  If that's what you're getting at, I agree.

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