Detroit has the concept of twenty minute neighborhoods and they've created several. The idea is the basics of what you need are all within a twenty minute walk. The idea is unless you're doing something out of the ordinary you won't need to use your car. Or even own a car.
They have executed pretty well with one glaring exception. Nearly everyone needs a weekly supermarket visit. Until fairly recently the city had no supermarkets for a population of 650,000 people. Recently a Whole Foods opened downtown as well as a couple of supermarkets on eight mile on the edge of the city.
Those eight mile supermarkets were created to cash in on a multi-million dollar incentive offered by the state. However it was poorly worded, so while they're technically in the city the suburbs are right across the street.
Many affluent highly educated people live in downtown Detroit and are forced to own a car so they can travel to the edge of the city to buy groceries.