Skip to content
Sponsored

Thanks to our advertising sponsor -

Critical Mass

From SF Critical Mass:

From SF Critical Mass:

Critical Mass is a mass bicycle ride that takes place on the last Friday of each month in cities around the world. Everyone is invited! No one is in charge! Bring your bike!

Critical Mass Do’s & Don’ts!

October 27th, 2009 by hughillustration

DO

• talk to stranger, bystanders, bus riders, motorists – welcome people to join us next time

• help cars stuck in mass to exit to the right

• stop regularly if you’re in front (no matter how slowly you think you’re going, gaps are opening up behind you)

• stop at red lights when in front to allow the rest of the ride to “mass up” behind.

• keep going in dense packs through red lights to stick together and keep it safe for everyone.

• fill gaps; Critical Mass depends on bicycle density to displace cars.

• remember that pleasure and friendliness are more subversive than anger and blaming.

DON’T

• race ahead to block cross traffic before the Mass has arrived

• ride into oncoming traffic on the wrong side of the road

• pick fights with motorists, even (especially) if they’re itching for one

• fail to turn and twist through the city to make the ride more interesting

• forget to smile and wave and talk to strangers!

• imagine that you are morally superior just cuz you’re on a bicycle (you’ll be in a car again soon enough)

• hesitate to tell other Massers what you think of their behavior, whether good or bad. Talk to each other!

• forget – we are all responsible to make Critical Mass what we want it to be.

Streetsblog has migrated to a new comment system. New commenters can register directly in the comments section of any article. Returning commenters: your previous comments and display name have been preserved, but you'll need to reclaim your account by clicking "Forgot your password?" on the sign-in form, entering your email, and following the verification link to set a new password — this is required because passwords could not be carried over during the migration. For questions, contact tips@streetsblog.org.

More from Streetsblog San Francisco

Bay Bridge Group Ride – A Celebration and a Reminder

Bike East Bay
April 28, 2026

Are U.S. Cities Ready for the Robo-Taxi Revolution?

April 27, 2026

Streetsblog Reviews Last Weeks California Bike Summit, Part 1: Advice on Living with Caltrans

April 27, 2026

San Francisco Celebrates One Year of Sunset Dunes

April 27, 2026
See all posts