King County iMap does not show a residential road at this location. Looking at Bing street imagery, there is no street sign. https://www.bing.com/maps?FORM=Z9LH2&cp=47.621275%7E-122.161731&lvl=19.8&pi=-11.6&style=x&dir=205.7

All of which looks like a shared driveway, which we tag as highway=service + service=driveway.