The R.H. Thomson Expressway was a planned freeway from WA-520 to Downtown Seattle.
Some links:
http://maps.live.com/default.aspx?v=2&cp=47.644163~-122.297261&style=h&lvl=16&scene=3695216 (http://maps.live.com/default.aspx?v=2&cp=47.644163~-122.297261&style=h&lvl=16&scene=3695216)
http://www.historylink.org/index.cfm?DisplayPage=output.cfm&File_Id=1229 (http://www.historylink.org/index.cfm?DisplayPage=output.cfm&File_Id=1229)
http://en.wikipedia.org/wiki/Freeway_and_expressway_revolts#Washington (http://en.wikipedia.org/wiki/Freeway_and_expressway_revolts#Washington)
http://blog.evandodds.com/2007/04/09/rh-thomson-expressway/ (http://blog.evandodds.com/2007/04/09/rh-thomson-expressway/)
http://seattlepi.nwsource.com/transportation/67389_get22.shtml (http://seattlepi.nwsource.com/transportation/67389_get22.shtml)
http://www.ciatrans.net/CStud-WA2.html (http://www.ciatrans.net/CStud-WA2.html)
http://soundpolitics.com/archives/006537.html (http://soundpolitics.com/archives/006537.html)
http://www.expresswaysite.com/washington_522.htm (http://www.expresswaysite.com/washington_522.htm)
http://www.nwhighways.amhosting.net/i90page_noframes.html (http://www.nwhighways.amhosting.net/i90page_noframes.html)
and
Google (http://ttp://www.google.com/search?hl=en&q=R.H.+Thomson+Expressway&btnG=Google+Search&aq=f&oq=)
Was? I take it they're not going to build it?
They cancled it...voters approved it and then the environmentalists protested it and WSDOT decided not to build the freeway.
This freeway would have linked WA-520 to I-90 along the MLK Jr. Blvd. corridor in Seattle. Even a freeway geek like myself finds this road to be a little on the excessive side.