Hamburg, the second-biggest city in Germany, is set to go completely car-free by 2030. (Click to expand.)

Now how about this for a goal for sustainability? Hamburg, the second-biggest city in Germany (population: 1.8 million) is planning to ban all cars from the city by 2034.
The ambitious ‘Green Network’ plan envisages a linked network of parks and green spaces, enhanced pedestrian and bicycle connectivity, and transit, with the goal of making car-free living a reality for every resident. A major impetus is climate change. Hamburg plans to make the entire city carbon-neutral.

The ambition of the Hamburg plan is in contrast to what is happening in Princeton. If a metropolis of 1.8 million people can make the entire city car-free, could Princeton not be a little braver in moving toward a car-free future?

What are the barriers to reducing car use in Princeton? What initiatives would make the most difference in enhancing alternative transportation?