Mass traffic isn't really the result of a 5-minute drive to McDonald's. It's the result of people only being able to afford single-family houses 1-2 hours away from their workplaces, and either having no commuter trains to get them there, or having city jobs that require driving in a car. For instance, in LA a lot of Uber drivers commute in from an hour away. Contractors, roofers, plumbers, all commute in. People who live in the city may actually get to work by biking or walking, but they aren't the vast majority stuck in traffic on the highways in and out every day. The problem really is the sprawling nature of the economy which necessitates spending hours in a car, not that people are so lazy they can't walk for five minutes.