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Path: utzoo!linus!security!genrad!decvax!duke!ucf-cs!giles
From: giles@ucf-cs.UUCP (Bruce Giles)
Newsgroups: net.physics
Subject: Car detectors at fast-food joints
Message-ID: <1092@ucf-cs.UUCP>
Date: Sat, 26-Nov-83 14:05:11 EST
Article-I.D.: ucf-cs.1092
Posted: Sat Nov 26 14:05:11 1983
Date-Received: Sun, 27-Nov-83 04:04:16 EST
Organization: University of Central Florida
Lines: 22


I have noticed at several local fast-food locations (I refuse to call
them restaurants) that the drive-thru lane has a small metal horn on
the menu board which is aimed downward.  These horns look suspiciously
like microwave horns.  I quess they would be used to determine if a 
large metal body (a car) is standing in front of the menu.


Questions --

<1>:	Are they microwave horns?
<2>:	If so, how much power do they transmit?
<3>:	Are they a health hazard like microwave ovens?
<4>:	What about rain or snow on the roadway?
<5>:	Can they interfer with increasingly computerized cars?
	(electronic ignition, cruise control, radios ...)
<6>:	Do they require FCC lincenses?


			    Bruce Giles
			    decvax!ucf-cs!giles (UUCP)
			    UCF, Dept of Math, Orlando Fl 32816 (Snail)