Car Detectors for Traffic Lights

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Article #21495

#21495

From: Mark Robert Thorson
Date: Fri, 26 May 1989 01:29

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Does anybody know how the car detectors for traffic lights work?  Are
they tuned circuits?  If so, what frequency?

More importantly, can they be activated from a distance?

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Message-ID: <18811@cup.portal.com>

Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!portal!cup.portal.com!mmm

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!portal!cup.portal.com!mmm
From: mmm@cup.portal.com (Mark Robert Thorson)
Newsgroups: sci.electronics
Subject: Car Detectors for Traffic Lights
Message-ID: <18811@cup.portal.com>
Date: 26 May 89 01:29:14 GMT
Organization: The Portal System (TM)
Lines: 4