P. what if all the streets were rivers? what would be different?

If all the streets were rivers, maybe the people will not use such as, motorcycles, engine cars and many more that will use an engine just to start their cars.. And if ever that all the streets were rivers, our air will not be polluted and it will be going a fresh air.. And also the people will be using a boat or something else that can be use in water because the people has no choice. It will be a big different from the land streets, because  the smoke of their cars can affect our airs specially our ozone layer that protect to us from the so much heat of the sun. While if we use a boat or something it will not effect our ozone layer because it has no smokes everytime it use. And it also helps our environment to be a smoke free.