Hello there,
Thank you for reaching out about the additional tagging here for these street features.
I did not add these tags originally but extended the road at, https://www.openstreetmap.org/way/1318347993 and https://www.openstreetmap.org/way/1318347994 , which carried over the pre-existing tags added by other users. Upon review, I agree that these tags are unusual and I can remove them from the features I extended. However, you may want to reach out to Alberto ngatia (https://www.openstreetmap.org/user/alberto%20ngatia) regarding the smoothness=p, start=*, and end=* tags they added, and SOGEFI (https://www.openstreetmap.org/user/SOGEFI) who added the note:sanitation and ref:city tags originally.
Thanks again and happy mapping!