Why Don't More Cities Have E-Bike Shares?

This week, Madrid became the first European city to launch a fully electric bike share system for its residents. It works just like a regular bike share, but better: An electric motor kicks in to help with pedaling, and most importantly, give you an extra push up hills. Why isn't this standard for bike shares… » 6/24/14 4:56pm 6/24/14 4:56pm