Elevator wait times are a major issue in cities like New York. Pressing a button and then waiting for the accessibility device to arrive and take you where you want to go is a common but frustrating and time-consuming problem. A 2010 study that measured the cumulative time that office workers spent waiting for elevators during the past 12 months showed that, for commercial elevators in New York, waiting time was 16.6 years! Los Angeles, Chicago and Houston followed with (8.7 years), (9 years) and (6.8) years, respectively. The study pointed out that better efficiency at the system level could help businesses save on energy and maintenance costs, and also improve employee productivity.