In many places like Bogota, Colombia and Paris, France there are many advantages to not using cars because:first, it would "promote alternate transportation..." and "devoid traffic jams", and second, it would help to "...reduce smog."

To begin with,according to Source 3: Car-free day spinning into a big hit in Bogota states that "It was the third straight year cars have been banned with only buses and taxis permitted..." because the Bogota leaders wanted to reduce traffic jams and promote alternative transportation.