On car-free day people don't get in their car and drive to work, instead they ride a bike or take a bus to work leaving the streets from having a traffic jam."Bogota, Colombia in a program that's set to spread to other countries, millions of colombians hiked, biked, skated or took buses to work during a car free day leaving the streets of this capital city eerily devoid of traffic jams."Days without cars goal is to promote alternative transportation and reduce smog.