Experts say such accidents do occur in prep sports, but it's critical that practice sites have first aid equipment on the scene.

CNN: STORY HIGHLIGHTS

Most often, the guardians' job is to dispense first aid, since in a wheeled crowd of this size, accidents do occur, especially as La Septima narrows into the city centre and the historic La Candelaria district, turning Ciclovia into a kilometres-long peloton.

BBC: Reclaiming the streets in Bogota

And if they're going to do that do you think that the First World, as it were, needs to start giving more aid to a Third World?

BBC: News | BREAKFAST WITH FROST | George Soros