Cars are loud, dangerous, and take up tons of space. What would happen if they just disappeared one day? I talk to Peter Calthorpe, founder of award-winning urban design firm Calthorpe Associates.Strauss: [I hate how they take up every piece of space outside. Everything is just cars, cars, cars, once you leave your door. So for this episode, I'm going to find out what would happen. If one day all the cars just disappeared. I found a guy who might know. Calthorpe: [Strauss: [This is flipped. The show that turns the world upside down to see what falls out. I'm Alana Strauss.I would love it. If you humored me with a thought experiment. If one day cars just disappeared. What would we do? How would the world have to change?Calthorpe: [It'd be a better place. There are many great European cities. Don't forget cars only came to dominate our cities. After world war two, we used to build beautiful cities that were walkable and had transit. We had streetcars suburbs that were served by these trolleys. You would take the trolley out to your neighborhood center and walk to your house.I mean, even small towns existed pretty happily without cars all the time. Elm street, wasn't that far from main street. You have to always remind yourself what your perspective is and what you consider normal. What would happen if you took away cars? They would all of a sudden realize that they have a massive reconstruction project in front of them, which is to reuse the roads and, uh, redevelop the parking lots and turn their communities into healthy walkable places.Strauss: [Calthorpe: [Listen for more.