On 19/07/2019 12:36, Philip Barnes wrote:
I cannot dispute this is legally a primary, OS Opendata shows it.
I would say the logical consequence of that argument is that no road should be mapped as tertiary, as, unless taken from OS, it is a subjective judgement and can't be consistently verified.
I think mapping it in conflict with a published official designation will devalue OSM.
As you hint, the correct thing to do, in mapping, is to map verifiable attributes that would make a rational router want to avoid it. Beyond that, like any tagging for the renderer issue, it is up to routers to use more than the primary classification in deciding whether to route.
This is going to get more important, with the continuing trend is to reduce signage, on the basis that it distracts drivers, and they have access to GPS maps so don't need it.
(As a variation on the last point, one of my pet hates, these days, is how few houses now have house numbers in the UK. It make it difficult to give accurate locations for fly tips - many of the apps use sources like Bing, which use address interpolation, and can be a long way out in some cases. I believe some US cities have bye-laws requiring them to be displayed.)
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