About 300 nude cyclists have ridden through the Peruvian capital of Lima to call attention to safety conditions and demand measures protecting cyclists.
Event organiser Octavio Zegarra said the protesters took to their bicycles nude to show that "this is our body".
He added: "With this we go out in the streets. We don't have a car to protect us".
Mr Zegarra asked others to "please respect us".
Official statistics show 2,830 people died in traffic accidents in Peru in 2011.