Residents of the Colombian capital, Bogota, have been enjoying the city's first-ever traffic-free day. Bogota's mayor, Enrique Penalosa, decided to ban private transport in an effort to cut pollution and to encourage people to use other forms of transport.
It was, according to Mayor Penalosa, "a beautiful, immense experiment", and most residents agreed.
The ban on private transport is for one day, and one day only.
More than 600,000 cars were left at home as most Bogotanos went to work by bike, on foot or even on horseback.
Giant jam
There were a handful of exemptions from the ban. Buses were let off, as were taxis and also the ranks of armoured jeeps used by government officials and diplomats.
The empty streets marked a tremendous change for Bogota. Usually, the morning and evening rush hours bring paralysis to the city streets, and every year more than 1,000 people are killed in road accidents in Bogota. Enrique Penalosa declared that the traffic-free day was a success. He said that air pollution had declined and that the city should do this sort of thing every year.
He also made it clear that Bogota needed to improve its public transport and also find the money to build a metro in order to keep the streets clear.
If nothing was done in the next few years, he warned, Bogota would soon become nothing but a giant traffic jam.