text: To conclude, it's great that more and more cities are pitching in to reduce polution due to cars. There are great advantages coming from the reduction of car usage, the best being less polution and smog. If more cities join in and the current cities keep doing what they are doing there could possibly be an even more dramatic decrease in the polution produced today.    Imagine a world of cars driving themselves. You would think "that's so cool!" or it's just like the future!" but I assue you it may not be all cracked up to what it seems like.