On Sun, Apr 6, 2008 at 11:08 AM, Richard Fairhurst <[EMAIL PROTECTED]> wrote:
> Relations are a super-powerful tool and permit all kinds of > whizziness (cycle routes, bus routes, areas with holes, dual > carriageways, etc.). This much we know. > > On looking through the latest UK planet excerpt, though, I note a > handful of cases where they're being used for simple road refs. So > there are route relations which have simply been set up to convey > ref=A813, etc. > > Could I 'umbly suggest not doing this unless there's very good reason? > > In the UK, road numbers are unique (apart from about three cases > where local councils have cocked up, e.g. the B4027) and no road can > have more than one ref. The relation doesn't give any info over and > above that in the standard 'ref' tags - it just increases complexity > for both editing and processing. > > cheers > Richard > In the US, it's common for multiple numbered highways to run on the same pavement. Just thinking of a few examples around the San Francisco Bay area, you could have several interstates running together for a while (I-580 and I-80), or a state highway together with an interstate (CA 12 and I-80) or two or more state highways (CA 12, CA 29, CA 121). For these cases, I've been putting them all in the "ref" tag directly on the way but separating them by semicolons. Karl
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