Libertarians should support aggressive parking enforcement. It's a clear correction of a substantial externality. Of course, an even more libertarian approach

Libertarians should support aggressive parking enforcement. It's a clear correction of a substantial externality. Of course, an even more libertarian approach would be to simply sell or lease the parking spaces to private entities and let them set whatever prices and rules they want for the use of their real estate, perhaps including making deals with local merchants to subsidize market rates during business hours.