text: My last reason is a very important reason and it is simply "safety". Think about it, it is simply just common sense. if they are less cars in the road at one time then the chances of car accidents decreases. Now i dont know about you but that sounds like a win win to me. One theres less accidents so theres less people in the hospital so they dont have hospital bills to worry about and less accidents means less traffic as well. And also if you ban the cars for a day or have one of them "car-free" cities you have less drunk drivers; one because they dont have a car so they will probably just drink at home and two if the bar or where ever is that there going to drink is close enough then they can just "walk" there sober and "walk" back to the house drunk instead of being in a car a causing a fatal accident.