On 04/08/18 07:01, Philip Barnes wrote:
The renderer cannot know not to render refs on C roads in the UK, remember osm 
is an international database.

Telling a driver to turn left onto the C666 is confusing if there is no sign to 
back up that instruction.

Routing type renderers need to know that a road is in the UK and handle it accordingly, because a lot of tagging has to be interpreted in the context of national legislation.

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