Participants' cars are supposed to be adorned with a white ribbon, sticker, or piece of paper, organizers said in an announcement of the event on Facebook. White has become a symbol of the protest movement after demonstrators wore white ribbons to the Dec. 10 protest on Bolotnaya Ploshchad.

So far, 1,283 people have indicated on Facebook that they will attend the event Sunday. Organizers stated as their goal to create a unbroken circle of cars on the road, which they calculated requiring 2,600 cars.

A cash prize will be given to the car with the best white decoration, popular blogger Ilya Varlamov said on his LiveJournal page Thursday. He said around 41,000 rubles has been collected so far.