My edit should have only affected standalone nodes (at traffic signs) which were not accompanied by a node on the adjacent way. Per the documentation:

"Insert a node with tag highway=stop on the approach way(s) that must stop, at the stopping point. Drivers may be required to give way (yield) whether or not a physical sign is present; but if you also want to capture the signs, you can use a traffic_sign=* tag as well"

(where "as well" is emphasized within the documentation).