[Tagging] Highway proposed/planned distinction

[Daniel Koć]

Hi,

We're about to abandon rendering highway=proposed in the osm-carto 
(default OSM map style), but we think it's still good to show those 
which are closer to be really constructed:

https://github.com/gravitystorm/openstreetmap-carto/issues/1654

Is highway=planned a good choice to be rendered instead or some other 
tagging scheme would be better?

-- 
"The train is always on time / The trick is to be ready to put your bags 
down" [A. Cohen]