Critical mass is a global action that is happening on the last Friday of each month. During this day people cycle their bikes or take self-propelled transport and drive in the streets. The event has no leaders or no other aims but to meet up once a month and enjoy the safety while driving. Since 2005 “Critical mass” started in Vilnius as well and is now widespread in many other cities. Now there is a Facebook group created where the information about the location and time of the “Critical mass” in Vilnius is announced.