Concurrent Highways

I’ve noticed that this program does not have a good means for handling concurrent highways. For example, in the Saint Louis Missouri area, Lemay Ferry Road is tagged as “US 61; US 67” causing an error which results in no highway label showing up at all until the 61/67 split near Festus. Does anyone know of / is there any way at all to circumvent this problem? I’m vaguely familiar with European highway labeling schema and know that concurrent highways are far less common there, but in the US this impacts significant portions of the US road system (i.e. I-70 which carries US 40 across sections of MO). I’m looking for a good way to handle this.