07/16/2009 05:12 am ET Updated Dec 06, 2017

World Naked Bike Ride Rolls Through Chicago (VIDEO, NSFW)

The sixth annual World Naked Bike Ride took place Saturday night, with hundreds of Chicago cyclists, skateboarders and roller skaters streaking through the city in various degrees of undress to raise awareness of global oil dependency.

The three-hour ride started near Oprah's Harpo studios and wove its way east through downtown, north up Michigan Avenue to Belmont, west until Ashland then south again toward the start.

Metromix has a safe-for-work slideshow of the event.

Some racier, not-safe-for-work slideshows here and here.

Watch video of the naked mass cruising Michigan Avenue, via Timeout Chicago:

The scene at Belmont:

Here's video posted by the organizers:

Last year the ride drew an estimated 1,700 participants. There has been no official word yet on how many participated this year.