TreeHugger loves ideas that make things smoother for non-motorized transportation. Here is one that would be a big help in cities that attract a lot of tourists: dedicated lanes. This would be particularly effective in New York, where the locals move really fast. As noted in Popup City, then the tourists can do what tourists do, like randomly change direction and walk into things while looking up instead of ahead.
It is produced by Improv Everywhere, who we have seen before in TreeHugger:
Taking Back the Streets: Three Interventions