I thought I saw one on 99W in Tigard, but I'm not sure exactly where I thought I saw it. I'll have to look again.
They've been replaced, quite thankfully. They were at Hall Boulevard and installed as part of a widening/signal project over a year ago.
Thanks to that project, there's also several fewer annoying "Interstate 99W" signs that were installed by the city. I cannot stand Tigard's sign shop, looking at a city spec sign makes me want to scream.