Critical Mass is a "spontaneous coincidence": a monthly bicycle ride to celebrate cycling and assert cyclists' rights to the road.

Seattle Critical Mass is on the last Friday of each month, rain or shine, 5:30pm at Westlake Center.

Each critical mass there is a group in the u district that leaves red square at 5pm and bikes to westlake center.

For cyclists on the other side of Lake Washington, a Bellevue Critical Mass may be starting soon.

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