Having a day where driving cars is banned instead of having traffic on the roads. Many countries including the United States are banning cars for a day or forever is becoming a new trend. The reasons that countries are doing this is so they clean up the air because the greenhouse gases have been a problem for the past couple years.

In Vauban, Germany the advantages of limiting car usage has been great for the suburban community. In souce 1 one of the residents said "when i had a car i was always tense. I'm much happier this way." So having only walking and using bicycles as transport the residents are better off without cars. Even in Paris they started the new trend after a near record pollution the enforced a no driving ban to clean the air. France had blamed diesel fuel since they favor diesel over gasoline and paris has more smog than any other European capitals.

Bogota, Colombia millions of the people during a car free day hike, bike, skate, or use the bus to get to work. They wanted to promote alternative transportation to reduce smog. "It's a good a opportunity to take away stress and lower air pollution," said carlos Arturo. Even Colombia's two other cities, Cali and Valledupar joined the car free day event. In the U.S president Obama has goals to curb the greenhouse gases. The shift in bahavior is because in a recent studies Americans are buying fewer cars.