Hi,

Not seen the discussion, time to move it to the community category forums, but my general observation is that hardly ever the 'length/width' of a drawn object is *exactly* as what is signed at bridges and tunnels and in many cases significantly off. So I'm a length/width tagger when I see (take picture of sign for documentation) and will add as supplemental source:length=*. In JOSM have a measuring tool so can get close, but not exact.

cheers