Took a Shuttle van to the PDX VA Hospital the 22nd Rest Area stop on top of US26 , stepped out onto a thin transparent sheet if Ice ..

Promptly fell on my Butt.. the others took note , and got out much more carefully.. this may be my next Purchase .. ICEtrekkers Diamond Grip Traction | Free Shipping at L.L.Bean

Im OK On the bike with Suomi Nokian Finland Made Studded tires , its Off the bike trying to walk that can get sketchy.
when the sidewalks are covered with Ice ..

At Sealevel , near the Ocean Its not as regular an occurrence as the Upper Mid west ..