The essay
When a city closes its core to private cars, the change looks at first like a loss of convenience. In practice it is a trade that favors the many over the few: cities should limit downtown car traffic, because the space returned to people on foot, on bikes, and on transit does more public good than the same space devoted to moving and storing private vehicles.
The strongest case for the policy is simply arithmetic. A single bus lane moves far more people per hour than a lane of private cars, a point Source B makes when it notes that a corridor's capacity "is measured in people, not vehicles." The distinction matters because downtown land is finite. Every lane and parking space handed to private cars is space that cannot also become a wider sidewalk or a protected bike path. When Source A describes a pilot district where foot traffic rose after car access was cut, it is not describing magic; it is describing what happens when the same square footage is asked to carry people instead of machines.
Critics answer that restrictions punish the people who most need to drive, and that objection deserves a real response rather than a dismissal. Source D is right that a delivery driver or a parent with a disabled child cannot simply switch to a bicycle. But a limit is not a ban. The cities that have done this well, as Source C points out, carve out exceptions for deliveries, accessible vehicles, and emergency access while still clearing the through-traffic that clogs a core without stopping in it. The goal is to remove the car that is only passing through, not the one that has a reason to be there.
That distinction is also what answers the economic worry. Merchants fear that fewer cars means fewer customers, yet Source A's data shows spending holding steady or rising on streets given over to pedestrians, because people who walk a district linger in it in a way that people hunting for parking never do. A customer stuck in a car is a customer who is not in a shop.
Limiting downtown car traffic is therefore not an attack on drivers but a decision about how to spend scarce public space. A city that reserves its core for the movement of people rather than the storage of cars is choosing the use that serves the largest number of its residents — and doing so without abandoning the few who genuinely need to drive.