Why not build a new city where there are no cars at all? That way, people like me can have fun with Pokemon GO while making sure to pay attention while walking around. You can freely cross the streets and you don't have to watch for traffic. Build a car-free city where people can live in. There would be no parking spaces for grocery stores and shopping centers, so a car-free city would be very compact. Plus, people can socialize in streets. If you need to go somewhere that requires traveling long distances in a compact, car-free city, a monorail can be built so that people can go to work and get back home. Gas stations and convenience stores are unnecessary, including restaurants with drive-through.
With all that done, people can have lots of fun with Pokemon GO because a world of Pokemon in games such as Pokemon Yellow or Pokemon Platinum do not have cars, but they do have bicycles! And people with smartphones still have to pay attention while walking! :)
But in a world of cars, I don't bother playing Pokemon GO. It's an accident waiting to happen if you do not pay attention.