MTA Bustime is progress (i wish all transit systems had this), but it just makes it painfully obvious how terribly run the MTA bus system is: busses always cluster together, instead of being properly spaced.
2015-05-21: It seems the reason (in NYC) is the inefficient boarding, which causes delays.

Click and hold a bar below to delay its respective bus. Note how even a short delay causes the buses to bunch together after a while. Hover over a stop to see its history. The area of the curve is cumulative wait time. Bunching makes the area

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