CNN spoke to UCLA’s Luskin’s Donald Shoup about why cities across the United States are cracking down on free curbside parking. Curb space is prime real estate for pedestrians crossing the street, residents looking for parking, workers dropping off food and deliveries, bicyclists, emergency vehicles, garbage trucks, sidewalk restaurants, electric vehicle charging stations and more. So a growing number of cities are removing free parking and charging for spots based on demand. Shoup, the dean of parking researchers in America, has been an advocate of such reforms for decades. “You pay for everything else related to cars. The one thing you don’t pay for — curb parking — is a mess,” he said.