Traffic congestion in New York City is bad, but it soon could be much better. Really. Take it from Robin Chase, the co-founder of Zipcar who now leads NUMo, the New Urban Mobility Alliance, our featured guest at September’s What’s Now: New York. One way to understand the current urban mobility problem in New York City and many cities around the world is to see our transportation system trapped between two paradigms. The old paradigm was organized for the last century around personal cars, while the new paradigm that’s emerging will be based on shared modalities, newly easy and convenient because of  technology.