I've heard this before but I'm not sure how it'd work. Would it just be trucks doing deliveries? Wouldn't they still need parking and roads? What's gained by banning the cars if you can't reclaim the roads?
Yes
> Wouldn't they still need parking and roads?
This would still be something like today's yellow zones.
> What's gained by banning the cars if you can't reclaim the roads?
There would be far fewer lanes for the remaining trucks on avenues, and non-avenues could pedestrianized with trucks only allowed to enter if they need to access something on that block.