text: I've deleted this as part of tidying up the other questionable edits in the area.  Once construction and the route is clearly defined starts it's worth adding as "highway=construction; construction=primary", until that point anything would be speculative.  "proposed" road schemes have a habit of being cancelled (I have an A-Z of Chesterfield from the 80s with Brimington bypass on it, and that's still "proposed").