That would be my inclination. I did some reading to be sure. I think a single way is how it should be mapped. With the center turn lane, it adds extra work in tagging the number of lanes, directions, and which are turn lanes I'm guessing it was mapped this way because of the center turn lane which can be solved with a tag.... I think. https://wiki.openstreetmap.org/wiki/Key:turn:lanes:both_ways