One Sunday last month, I was standing at a subway station and the overhead monitor informed me that the next train was to arrive in 9 minutes. 30 seconds later, it anticipated an arrival in 7 minutes. Two minutes later the monitor said the train would arrive in 6 minutes. 3 minutes later, the train arrived, but was out of service.
Hint: If your solution to a problem is to actively broadcast the degree to which you’re deviating from a planned action, ensure that your description of the deviation is more accurate than the deviation itself.
Better yet, stop wasting time and money on systems like this that are designed solely to respond to symptoms of a problem. Attack the problem, not the symptoms.