I live in Dallas city center and I can only think of two roads that have more than a single lane in each direction. Banning passenger vehicles may still make pl

I live in Dallas city center and I can only think of two roads that have more than a single lane in each direction. Banning passenger vehicles may still make plenty of sense for other reasons, to reduce pollution, noise, congestion, make it safer for pedestrians. And a few streets have actually shut down to vehicle traffic in the past decade. But I don't know what you're imagining about space. The roads we have aren't going anywhere. Aside from emergency vehicles, trucks still need to get in to make deliveries, and they require more space than passenger vehicles. The intercity bus station and both metro transit transfer centers are also in the city center, so seemingly you need room for buses, which also require more space than passenger vehicles. The water and sewer mains also run under the roads and need to have some minimum circumference to allow the throughput to supply a city center. Even if we somehow managed to eliminate roads, I'm still not sure I get what you're imagining. Are we going to tear down all of the existing buildings and replace them with buildings that have 7 meter wider bases? That would take decades and render the city mostly unusable while it was happening. There would also need to be room for trucks to bring in construction material and remove waste.