This to me comes across as reaching: It's easy to design streets that are for people, but accommodate the occasional delivery vehicle, or ambulance. (A standard ambulance is only about 8 feet wide.) How often are people buying new couches or having heart attacks, anyway? We also don't need most of the road infrastructure for transport of goods, and service vehicles. Every city street, county road, state highway, or Interstate highway that I've ever driven on, anywhere, has a vast majority of consisting of personal vehicles, with the exception of I-80/94 through Gary, Indiana. Freight-carrying trucks aren't even allowed in the 3rd, left-most lane most of the time. Suburban streets are crazy wide; much wider than needed for freight delivery, or even the large units that fire officials insist upon. Smaller fire trucks exist, too, and are very effective where they are used. And, even if subgrade detention is the best solution in a particular situation, something like, say, a park can go on top, and offer much better infiltration than a parking lot. I know of stormwater vaults in large buildings, so they don't necessarily preclude buildings on a site. In any case, how many parking lots have a detention basin underneath?

Lastly, you're severely misrepresenting my point of view by comparing to wailing, "cars bad," and thinking that's a solution. No, I look to solutions that cities around the world (including my own, in some limited cases) have actually, successfully implemented. Adding lanes is the only politically viable solution sometimes, but it mostly just makes the problems worse in the long-run.