One odd thing I've noticed during this mural project is that Portland bike shops are very likely to have murals outside. I'm not sure why exactly, and it's not like I've run the numbers and have an exact percentage to give you, but it's more common than just about any other sort of business, with the possible exception of tattoo places. Today's example is at Cyclone Bicycle Supply, at 21st & Vaughn in a weird corner of industrial NW Portland. I ran across this one in a Bike Portland article while searching for an entirely different bike mural. The article lists a few of those, and mentions the mural was created in 2012 by artists Jeremy Eaton and Nick Makanna.
The "Go By Bike" sign in the mural is a play on the "Go By Train" neon sign that's long graced Portland's Union Station, and the "Go By Streetcar" sign that's been in the Pearl District since the early 2000s. I could swear I've seen a real, live "Go By Bike" sign somewhere around town, but for the life of me I can't recall where I saw it. It's possible it wasn't real after all and was just a detail in another bike mural. It all gets to be a big blur after a while.
Updated: Apparently the "Go By Bike" sign is at the massive bike corral next to the South Waterfront aerial tram station. Thanks to gl in the comments below and @WookieOfDoom on Twitter for pointing this out. Another commenter mentions there's also a "Go By Cab" sign at Radio Cab in NW Portland. At this rate I have to assume there's a "Go By Enormous SUV" sign somewhere in darkest Tualatin.