http://image.url.photobucket.com/albums/v376/mimthehood/f556afaf.gif Critical Mass is a bike ride typically held on the last Friday of every month in cities around the world where bicyclists and, less frequently, skateboarders, roller bladers, roller skaters and other self-propelled commuters take to the streets en masse. Critical Mass is not led, and has no officially-stated message, though it is largely understood to be an effort to promote alternative (non-motorized) modes of transportation and to raise awareness about safety issues commuters using non-motorized forms of transportation face in sharing the streets with motor vehicles. Participants meet at a set location and time and enjoy the security and companionship of travelling as a group through city streets intentionally causing a mild and temporary disruption to vehicle traffic. The general philosophy behind the ride is expressed in the widely-used slogan, +++''''' "We aren't blocking traffic; we are traffic." '''''+++ <p> http://image.url.photobucket.com/albums/v376/mimthehood/CM-logo1.gif <br> http://img.photobucket.com/albums/v376/mimthehood/bicycle.gif http://img.photobucket.com/albums/v376/mimthehood/bicycle.gif http://img.photobucket.com/albums/v376/mimthehood/bicycle.gif <br> [http://critical-mass.info/index.html Worldwide Hub] <br> [http://bicyclesafe.com/ How NOT to get hit by Cars] ''Source:Wikipedia'' Wikipedia:Critical+Mass Image: Via [http://www.bikesexual.org/cm/ Vancouver CM]