While there aren’t many definitive statistics about bicycle usage in the U.S., with cities from Chicago to New York to Portland installing an increasing number of bike lanes and promoting bicycle shares and safety, it’s pretty clear that cycling, as a primary means of transportation, is on the rise. According to a National Survey of Pedestrian and Bicyclist Attitudes and Behaviors, reported by bicyclinginfo.org, “approximately 57 million people, 27.3 percent of the population age 16 or older, rode a bicycle at least once during the summer of 2002,” the latest year for which data is …