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From: williams@srcsip.UUCP (Susan Williams)
Newsgroups: net.analog,net.auto
Subject: Re: Car Detectors
Message-ID: <4347@srcsip.UUCP>
Date: Fri, 2-May-86 10:19:31 EDT
Article-I.D.: srcsip.4347
Posted: Fri May  2 10:19:31 1986
Date-Received: Thu, 8-May-86 08:05:58 EDT
References: <2974@watvlsi.UUCP> <4839@topaz.RUTGERS.EDU> <992@kitty.UUCP>
Reply-To: williams@srcsip.UUCP (Susan Williams)
Organization: Honeywell SRC (SIP), Mpls MN
Lines: 12
Xref: linus net.analog:794 net.auto:9311

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.