text: What would happen if every country had a day with no cars? The city of Bogota, Columbia has had a Day without cars once a year for quite a few years. Just recently, other Colubian cities have joined in and even Paraguay's captial has participated. What this day is supposed to do is promote the use of other types of transportation, for example; walking or biking. It also reduces smog and the amount of air pollution, in retalliation, improving the city. In Bogota, there is a $25 fine for those who do not participate in thsi environtmentally helpful day.