the device over there on the right, with the silhouette of the bike and the two chevrons, is a "shared lane marking," or more colloquially, a "sharrow."
the 2009 manual on uniform traffic control devices includes the sharrow at section 9C.07 as an optional treatment on roads on which the outer travel lane is too narrow to share. the intended purpose of the device is to indicate "lateral lane positioning," that is,
(a) to tell cyclists they should move to the left, away from the curb or out of the door zone, and
(b) to tell motorists they should expect to see cyclists claiming the entire lane.
the device may be used in conjunction with signage indicating "bicycles may use full lane," though this is not required.
over the past several weeks, PBoT has been putting these down on some of the newly designated bike boulevards -- klickitat, holman, going, etc. but they are not being used to indicate lateral lane positioning. they are being used as wayfinders.
evidently, PBoT made this choice because there was stimulus money available, but they needed to use MUTCD compliant signage and pavement treatments to get the grant. they did snag close a million dollars for this project, but it seems to me the money would have been better spent putting sharrows where they are actually needed, for example on northeast 28th, or on southeast hawthorne, or on the couch/burnside couplet. evidently putting sharrows on those roads is not a priority for PBoT.
as wayfinders, the sharrows are quite visible. but something else on a similar scale would have served just as well, though the money would have had to come from some other source, maybe bioswales.
my objection is not only that we need sharrows elsewhere, but that they are inappropriate here. lane positioning is not really an issue on a bike boulevard, where there is hardly any motor traffic, relatively few cars parked on the street, and average speeds are in the teens and low twenties.
and to make matters worse, on the narrower streets, like klickitat and holman, these sharrows have been placed not just to the left of the door zone, as contemplated in the MUTCD, but right on the center line (sometimes, weirdly, slightly to the left of center). this completely negates the intended purpose of the sharrow, diluting its usefulness in situations where it is actually needed.