Saudi Crown Prince Mohammed bin Salman is promising to build a network of smart cities that won't have any cars or roads. It's called The Line, due to its arrangement of "hyper-connected future communities," and will form part of NEOM, a $500 billion project announced in October 2017. According to the prince, the development will offer "ultra-high-speed transit," autonomous vehicles and an urban layout that ensures basic facilities, such as schools and medical clinics, are never more than a five-minute walk away. "It is expected no journey will be longer than 20 minutes," the project's organizers claimed in a press release today. One million people are supposed to live inside The Line.