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[–] 31 points 3 weeks ago (3 children)

It's not just friction, it's also the space per passenger (aka number of passengers relative to vehicle size). That's why airplanes and bicycles work too, despite not being iron rolling on iron.

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  • [–] 12 points 3 weeks ago

    Bikes are low friction as heck, the rolling resistance of a wheel on a road is low with that small amount of weight.

    So yeah, amount of machine per passenger (which in a car is often only 1 person) and amount of infrastructure it takes to support that per person

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