Bike-friendliness doesn't just happen. It's the result of grassroots advocacy and urban planning. Here's a look at five American cities where planning and enthusiasm for bikes equals great rides for you and your family. 1. Portland, Oregon. This perennial biking favorite is the lone large city ranked "platinum" by the League of American Bicyclists. Compact and inherently bike-able, it's benefited from city initiatives that created "bike boulevards," where speed limits discourage autos.
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