If they went to cars, they'd have to spend a lot of time and money moving them around. And a car that will move costs a lot more than a chunk of concrete. And t

If they went to cars, they'd have to spend a lot of time and money moving them around. And a car that will move costs a lot more than a chunk of concrete. And the car has to be registered. According to the article, the city is set up to tow cars, but not set up to move the concrete blocks. The blocks are actually probably easier to move than the cars, if you set up a system for doing it. A flatbed with a crane could move those blocks out in time comparable to hitching up a car for towing, and carry more than one at a time. On edit: cars would probably get vandalized, too. I am not saying I support that, but it makes rotating cars even more impractical.