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From: rls@ihu1g.UUCP (r.l. schieve)
Newsgroups: net.cycle
Subject: Re: Smart Traffic Lights?
Message-ID: <659@ihu1g.UUCP>
Date: Mon, 22-Jul-85 08:30:08 EDT
Article-I.D.: ihu1g.659
Posted: Mon Jul 22 08:30:08 1985
Date-Received: Thu, 25-Jul-85 00:20:00 EDT
References: <658@ihu1g.UUCP> <2637@ihuxf.UUCP>
Distribution: net
Organization: AT&T Bell Laboratories
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> Does anyone know how these sensors work?  I had all ways assumed it was
> tripped by weight until a friend said he always thought they were 
> magneticly tripped.
> 
> 
> 				Mike Nelson
> 				ihuxf!cuda

People that responded to my original posting seem to agree that it
is the metal in a bike that trips the sensors not its weight.
When installing the  sensor it is simply just a loop of wire that
does not care how many layers of asphalt are put on top of it.  Many
have said that if the sensor loop is visable to stop or follow an
edge of the loop.  I had always tried to park in the center of the
loop and will have to try the edge method.

Also someone suggested getting the sensor sensitivity re-adjusted.
I called the highway department and they said it could be done and
the particular intersection that I complained about would be looked
into.  I wonder how long it will take......

				Rick Schieve
				...ihnp4!ihu1g!rls