Here’s a simple picture of how much space that cars, bus, and bikes take in comparison to the number of people using it. I have to say they should add skateboards, which should definitely come on top for the most eco-friendliest vehicle.
In this image, you can see three interpretations of what it takes to get the same amount of people into town for work, shopping or for whatever reason they would need to travel. They have chosen three modes of travel, car, bus and cycle, this picture says it all.

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