Tokyo does not yet have an orchestrated car-free day, but across the city back streets and a few major roads in shopping areas are shut off to motors on the weekends. Many streets around primary schools are also blocked to motor traffic during hours that kids commute to school (about 8-10am and 2-4pm) each and every day. It is fabulous.
Last week, Tokyo had the biggest dump of snow it had seen in 8 years. Roads (especially back streets) were blocked to traffic
throughout the city all day. It was so fantastic. Quiet, clean, and safe. I always thought it was the snow that caused the community to have that fantastic atmosphere when it snowed. It's not - it's the fact that the streets are reclaimed for a day. I can only imagine this is what it is like in Bogota. Fantastic.
Oh yea, I also recently noticed that a big delivery company here in Tokyo is also now using electric bicycles with trailers!! Fantastic.