That's the conclusion in Philly:
Since 2002, the number of cyclists on many Center City streets has
more than doubled, according to tallies at key intersections, and the
percentage of bike commuters has also doubled.
...
Traffic crashes involving bikes in Philadelphia have fallen from a
high of 1,040 in 1998 to 553 in 2010.
http://articles.philly.com/2012-09-17/business/33881208_1_bike-sales-bike-lanes-bicycle-coalition
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