I can think of one very good example, just off the top of my head. There's a very small city in middle Germany called Nuremberg. It's a small city of under one million people. They have a subway system, a light-rail system, a bus system, and a high-speed rail system all going through the city. People don't use their cars, basically. They can go anywhere. This is for under one million people.
If they could travel and talk to some people who made those decisions in places like that, it would go a long way in explaining how these integrated policies came together.