Critical Mass Seattle is a social bike ride starting from Westlake Park – 4th and Pine and going wherever. Cars rule the road every day, but one day a month we get together to celebrate our love for bicycles and have fun riding our bikes. This is generally a slow-paced ride where persons of all skill levels can participate. Costumes and decorated bicycles, trailers, signs, flags, noisemakers, gettoblasters, sound systems, drums, and wildly modified bicycles are all highly encouraged!