Summer sale: Save 58%

Topic: bike-sharing

(photoiva/Shutterstock)

Lindsay Abrams
(<a href='http://www.shutterstock.com/gallery-73910p1.html'>Miro Vrlik Photography</a> via <a href='http://www.shutterstock.com/'>Shutterstock</a>)

The unstoppable rise of bikes

Lindsay Abrams
(Photo courtesy of Benjamin Lester)

Cyclists stage mass "die-in"

Lindsay Abrams
The tablet-equipped GoBike (GoBike)

Lindsay Abrams
(AP)

Katie McDonough