On 04/08/18 10:31, Lester Caine wrote:
'display_ref=no' would be appropriate in some areas of the world

As I hinted in a previous response, this is an attribute of the junction, not the road. Moreover, it is probably a directed attribute, so actually relates to a turn relation.

Also, display_ref is imperative. OSM attributes should be declarative, so I think you would want something closer to ref:signed=false.

In practice though, anyone adding C references in the UK is, to some extent, armchair mapping, so I don't think you can rely on this reflecting the on the ground situation in most cases, so I still thin the renderer need to apply the rule:

If in the UK and ref:visible not present for the intended turn, assume ref:signed no if the destination reference begins C, otherwise yes. However, turn right in 100m may be safer for all minor turnings (road names don't get replaced when damaged, even for residential roads).

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