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From: philm@astroatc.UUCP (Phil Mason)
Newsgroups: net.analog,net.auto
Subject: Re: Car Detectors
Message-ID: <375@astroatc.UUCP>
Date: Wed, 7-May-86 14:02:50 EDT
Article-I.D.: astroatc.375
Posted: Wed May  7 14:02:50 1986
Date-Received: Sat, 10-May-86 13:40:55 EDT
References: <2974@watvlsi.UUCP> <4839@topaz.RUTGERS.EDU> <992@kitty.UUCP> <4347@srcsip.UUCP>
Reply-To: philm@astroatc.UUCP (Phil Mason)
Organization: Astronautics ATC, Madison, WI
Lines: 30
Xref: linus net.analog:797 net.auto:9347

In article <4347@srcsip.UUCP> williams@srcsip.UUCP (Susan Williams) writes:
>In article <992@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
>>In article <4839@topaz.RUTGERS.EDU>, josh@topaz.RUTGERS.EDU (J Storrs Hall) writes:
>>> What's the circuitry behind the buried-wire car detectors at
>>> stoplights?  Technical details please.
>>
>>  [Technical details]
>
>When I see these things, I am always intrigued about how they are
>installed.  There is usually a thin octagonal shaped cut in the
>pavement, and none of the surrounding pavement seems to have been
>disturbed or replaced.  Does anyone know how they do this?  So
>far I have guessed that they must not be placed very deep.

Yes, I've seen it done.

They use a very slender version of a "Ditch Witch" type digger.  It's kind
of like a chain saw, but with asphalt-proof teeth and special wheels to guide
it.  I wasn't able to get a real close look, but it seems they only go 2-3
inches deep. After laying the wires, they add some sealing caulk.


-- 
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Kirk  : Bones ?               Phil Mason, Astronautics Technical Center
Bones : He's dead Jim.        {Your Favorite System}!uwvax!astroatc!philm

My opinions are mine and not necessarily those of my employer.
(I would like to think that my employer believes in them too.)  :-)
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