How the duration of Boston bike sharing rides fare against Google Maps estimates?
Each area plot is a histogram of the number of 2016 Hubway bike trips of a certain distance and duration. The histograms are positioned one on top of each other going from shorter trips to longer ones. The higher the area plot, more bike trips on that combination of distance and duration.
The time axis represents the time difference between the bike commute and the Google Maps estimative for that route.