Street parking in downtown Louisville will be more expensive starting in July.The Parking Authority of River City has voted, and parking meter rates will jump by 25 cents per hour, bringing the total cost for 60 minutes of parking to one dollar.Parking meters are a handy revenue source for governments, too. Marketplace recently toured a few cities where mayors were looking to boost budgets with higher parking fees or parking privatization. But as cities turn to parking, transportation advocates are turning against it. In recent years, activists have called metered parking inessential, unfair and even unethical.