A rather rough rough. The rose represents on behalf of the Rose City, of course, and was clipped from a lower-res photograph I have here strictly for visualization purposes.
The rose graphic might not be completely acceptable for a metropolitan route network–after all, Portland isn't the whole of the Metro area, and other Metro area towns that are not Portland can be somewhat resentful of a Rose-City-centric symbol for a badged route running through thier neighborhoods.
But this gets the general gist of the idea across. The pentagonal shield is, of course, the commonly-used county route cutout, and the idea of personalizing the shield with a commonly-recognizable symbol rather than words (such as METRO ROUTE) was inspired by the way Charlotte NC adorns the Charlotte Route 4 sign with the crown from the city's logo.
Tags: Portland, pdx, Portland Metro, PDX Metro, Metro Routes