15 of the world's most bike-friendly cities

Grab a helmet and check out these 15 cities where drivers use all five fingers when they wave at you. The " bicycling capital of Europe" tops many lists -- including this one, it seems -- as the most bike-friendly city anywhere. Safe and extensive route networks, serious governmental promotion, and a bike culture that transcends class boundaries are all reasons why 40 percent of the city's traffic moves on two wheels. 

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