text: Posted this in osm-ca Slack and got the following from Matthew Darwin:
  
  "We had this discussion in Ottawa (Eastern Ontario). What was implemented was 400 Series highways get name="Highway 4xx" and official_name="whatever".  Additionally Highway 401 has multiple names for part of it, so name, official_name, alt_name are all used.  Also with :en and :fr suffixes as needed. See https://www.openstreetmap.org/way/4071712 for the most complex example."