Zoo Bomb

An update for my recent post on the bikes adorning the street sign. I have learned that these are most probably part of Portland's "Zoo Bomb" bike event. Every Sunday people gather at the Oregon Zoo in the city's west hills, some wearing costumes, where they proceed to "bomb" down the hills. This event has occurred weekly for 10 years. Mini bikes and unusual bikes are encouraged. Those without bikes can borrow one from these collections of bikes at different points in the city.