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Old 04-20-2011, 07:16 PM   #2
Bernie Cunningham
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Join Date: Jun 2002
Location: Southern California
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Default Re: Red Light Answer

As far as I know, that type of sensor is no longer used, as in where light reflections or flashes would cause them to 'switch'.

These days the units are a sender and receiver across the track and must communicate with each other to 'switch'
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