Copenhagen, the bicycle-friendliest place on the planet, publishes a biannual Bicycle Account, and buried in its pages is a rather astonishing fact, reports Andy Clarke, president of the league of American Bicyclists:

“When all these factors are added together the net social gain is DKK 1.22 per cycled kilometer. For purposes of comparison there is a net social loss of DKK 0.69 per kilometer driven by car.” 1.22 Danish crowns is about 25 cents and a kilometer is 6/10 of a mile, so we are talking about a net economic gain to society of 42 cents for every bicycle mile traveled. That’s a good number to have in your back pocket.'

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Yet in a new study (pdf) in the journal Transport Policy, Ralph Buehler and John Pucher suggest that cities might actually be able to influence how many cyclists are on the road. Perhaps all they have to do is — and this shouldn’t come as a huge surprise — build more bike lanes and bike paths.