Disclaimer: I'm new to the OSM mailing lists, so hopefully I didn't screw up my email :D
~~~~~~~~~ I must say that I find both "Relation:type=stop" and Roy's ideas interesting. The former suggests that we abstract reality away while the latter suggests we mirror reality in OSM. Mirroring reality will always result in more precision, but there is often a tradeoff for simplicity. For instance, OSM maps multi-lane roads with a single way. Although mapping individual lanes would result in a map closer to reality, there are few benefits and the work required for mapping, rendering, and routing would be significant. Unless there are a number of benefits that arise from knowing the precice location of a stop sign it seems more reasonable to use relations for this job. They're slightly easier to map (no precision surveying required) and far easier to get software working with. The one downside I can see is that you loose the ability to know exactly WHERE a sign is -- information that I'm hard-pressed to think of a use for (not to say that there isn't a use, mind you).
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