FACTOID # 2: Puerto Rico has roughly the same gross state product as Montana, Wyoming and North Dakota combined.
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Encyclopedia > Interlocking

Interlocking in railway terminology (US) is a term used to describe an at-grade crossing or other junction of two or more railroads, or any railroad switching complex in which the switches and the signals controlling train movement over those switches is interlocked so that it is impossible to give clear signals to opposing trains in such a way that the trains would collide. Rail terminology is a form of technical terminology. ...

An interlocking also makes it impossible to give a clear signal to a train if the switches are not aligned properly so that the train movement can be accomplished.

Interlocking was, and often still is, accomplished by mechanical means, in which the levers and mechanism controlling the switches and signals can not be physically placed in conflict. More modern plants may be controlled by electronic circuitry (nowadays, all metro equipment use computer based interlocking systems).

In music, the term interlocking is occasionally used to describe a Hocket. In music hocket is the rhythmic linear technique using the alternation of notes, pitches, or chords. ...

  Results from FactBites:
Breath alcohol ignition interlock device - Wikipedia, the free encyclopedia (397 words)
A breath alcohol ignition interlock device (BIID or IID) is a breathalyzer installed into a car that will not allow the car to start until given a breath sample that has a lower Breath Alcohol Content(BAC) than the ignition interlock has programmed into it.
If the breath sample isn't provided or the sample provided exceeds the ignition interlock's preset BAC level it will log the event, warn the driver and then start up a specific alarm system (e.g., lights flashing, horn honking, etc.) until the ignition is turned off.
Modern ignition interlock devices use an ethanol-specific fuel cell for a sensor, limiting what may be read as alcohol.
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