That crosswalk on Calle 49 at 50 is not actually floating. It was just drawn that way.
Picking up on a trend seen all over the world, the Municipal Police Directorate is trying out an optical illusion meant to startle drivers into watching out for pedestrians. The yellow path appears to be levitating because dark shadows are painted next to them, at an angle that suggests that they are blocking cars and trucks.
Iceland, England and Spain, as well as many U.S. cities, have already experimented with the idea. In London, studies showed that drivers were more alert when approaching them.
City workers are monitoring the intersection for driver behavior before they expand the concept to other parts of the city.
Source: Punto Medio