Just my thoughts: It would not be overnight. The infrastructure should change before the people do. The infrastructure needs to make it easier for people to walk, bike or take public transportation, rather than use their cars. Decrease the size of supermarkets, but make more of them and more spread out, so people can walk or bike to them. Create train lines that go to the most popular destinations like malls, schools/universities, hospitals, etc. Then remove car lanes from roads and make them into bike lanes. There needs to be bike lanes on all big roads. Otherwise cars have a "shortcut", which is not what we want. We want the bikes to have shortcuts. So we could make bike only "roads" which only are as wide as one car lane. But this will take a lot of money and motivation. All these things amplify the usefulness of each other. But that's just some of my rambling. Feel free to tell me wrong, or suggest something better.