text: Congestion, the amount of car traffic in a specific area, is significantly decreasing due to a new idea that has sprung:limiting car usage. Places such as Vauban, Paris, Bogota, Cali and Valledupar are participating in a program that's made to decrease car usage. Some of these cities enjoy Day Without Cars, a holiday that "promotes alternative transportation and reduces smog". (Selsky 1) Businessman Carlos Arturo Plaza says that "It's a good opportunity to take away stress and lower air pollution."