Looking at human-powered vehicles seem to me to be a much better solution. While in China I watch in amazement as people bicycled past carrying things like five medium pigs or a large fridge.
Blast, if you've ever been to Long Beach Island in NJ there are a bunch of places there that rent pedal-powered cars. Normally they fit four people, who each have a set of pedals to power it. We used to rent them all the time (it was a fun way to get around town, but quite a bit of work since they don't have adjustable gears).
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