The authors have obtained the data log for each of the bike share programs included in this analysis. This log contains
information on each trip taken throughout 2012. Each system runs 365 days per year, with the exception of Minnesota,
which was open from April 8th to November 7th, 2012. Each trip has a start and end date and time, as well as the origin
and destination docking station. Trips of less than 2 min or greater than 3 h have been omitted from our analysis. This
decision was made on an assumption that such trips are unlikely to represent genuine bicycle riding time but rather a result of operator or technical error (e.g. a bicycle not removed or docked correctly).