Also, I saw one instance of justification for some of these redundant way-names as making the road match with addr:street on nearby buildings. This is tricky, as it runs into the same issue I outlined two comments up: our road network is highly decentralized in the US, and many entities cooperate with loose terminology. When a county applies physical addresses to land parcels, it may do so with the form "Hwy 67" instead of "Lindbergh Boulevard", but that IMHO does not justify renaming the road to a variant of the former.