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From: bruce19@ihuxi.UUCP
Newsgroups: net.auto
Subject: Re: speed w/o radar alert
Message-ID: <534@ihuxi.UUCP>
Date: Wed, 24-Aug-83 09:51:44 EDT
Article-I.D.: ihuxi.534
Posted: Wed Aug 24 09:51:44 1983
Date-Received: Wed, 24-Aug-83 17:10:10 EDT
References: <1465@tekid.UUCP>
Organization: BTL Naperville, Il.
Lines: 17

I have to comment on all the "unmanned" and "radar" speed trap
articles.

Until three years ago I worked for a company that made speed
detectors that did not use radar or rubber hoses.  Speed was
determined by measuring the interval between two inductive loops
in the pavement.  These same loops were also used to detect if
there was left-turn traffic at multi-phase lights, to detect if
a car had approached a parking lot gate, etc, etc.

The detectors balanced two or three turns of wire in the pavement
against a reference inductor and the car's iron near the loop
upset this balance and triggered an output.  These devices are
less costly than radar, more reliable than radar, not regulated
like radar (FCC), etc.

You can be clocked and your radar detector will never go "peep".