I've noticed several of these lately. This on is on SW 18th Avenue, beside PGE Park, a sports venue a few blocks from our apartment. Some days I walk by it on my way to SW 3rd and Salmon, to catch the bus that takes me across the Willamette River. I walk or ride by another one down NW Everett, at NW 4th Avenue, I think.
Right now I don't know one thing about these signs, other than that they're intriguing. I don't recall seeing a bicycle chained to one, but surely that could be a use for them. I don't know if they designate some sort of trail, an idea that seems implausible at best. If they were to call attention to something specific, why isn't there more information there?
I'm curious. If I learn more, I'll update you.
