If you run the validator in JOSM, it will complain that there's an "alt_name without name." If the name "2100 South Freeway" isn't signed anywhere, that can be indicated with `name:signed=no`. If there is no other name that the freeway goes by, wouldn't the nickname that locals use (which is the only name aside from the designation, which is not a name) be put in `name` (since there's no "official" name)?