On repeated visits to NY, frustrated by the inefficiency of getting from A to B, one of my repeating dreams is the idea of closing every other street (both N-S and E-W) in the grid system to cars, and only allowing bikes, scooters, skateboards, and maybe buses. (Delivery traffic strictly outside daytime hours).
Imagine the transport utopia that would gradually develop, as more any more people not only feel safe to ride bikes, but realised that it represented the most efficient solution.