jakeroot
That said, WSDOT maps shows SR-500 as extending all the way to 4th Plain as freeway. As "trunk" and "motorway" are not legal jargon in the US, it is probably advisable that we recognize "freeway" as meaning "motorway" for the purposes of OSM mapping.

http://www.wsdot.wa.gov/sites/default/files/2017/08/31/highway-map-Vancouver.pdf (note: it has not been updated to recognize Falk and Stapleton RIROs).