According to the Bureau of Labor Statistics, cab drivers and chauffeurs make a median salary of $22,400 per year, or $10.79 an hour. (I believe that's not including tips.) Using about three months of fare data from a single driver, Alvin Chang for The Boston Globe showed how a driver makes a living day-to-day.
Time runs left to right, and each column represents fares collected in a day. A driver starts each day in the red when he or she leases a cab for $125, which includes gas, and then works into the blue.
After an animation plays out over a few seconds, you can click to zoom in and see specific fares. I expected to drag left and right once zoom, but the chart just zooms back out. I suspect the interaction is mostly there for people on mobile devices. I also wanted to scrub the vertical line that indicates time to see details for spikes or days no fares were collected.
So there's still a bit to be desired here, but the data itself is interesting, which makes it worth a look.