text: "It's a good opportunity to take away stress and lower air pollution", said buisnessman Carlos Arturo Plaza as he rode his bike.  Municipal authorities from all over the world came to see this event. The city's mayor also says that the day without cars is part of an improvement campaign that began in Bogota in the mid- 1990's.  The advantage of the car-free day has made parks and sports centers more popular to go to and other advatages is that the old sidewalks are being replaced with new paved ones.  The traffic has also reduced.