Uber cars aren't on the road most of the time. Yellow cabs are. Those taxi medallions are
expensive and they operate with shifts of drivers, the goal being to keep the taxi running 24/7, except when it needs maintenance.
It's pretty typical for any given cab to have three different drivers running in 12 hour shifts. That way you keep it on the road all 168 hours of every week. An Uber just requires a relatively inexpesive TLC license plate, not a taxi medallion, so it's typically only driven by one driver, say an average of 40 hours per week.
