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Re:The 144 Million Dollar Button by adgar on Sunday May 13, 2012 @02:02PM (#3967706)
The lights.

A NYC cab's lights look like this:

|O|Number|O|

Where "O" is "Off Duty" in smaller letters.

If just the Number is lit, they're available, on the clock.

If Just the Os are lit, they have a fare.

If both are lit, they're available, with destination discretion.

If none are lit, they're not working at all.

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