Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!apple!portal!cup.portal.com!CPS
From: CPS@cup.portal.com (CHRIS PATRIC SMOLINSKI)
Newsgroups: sci.electronics
Subject: Police Laser Speedtraps?
Message-ID: <42808@cup.portal.com>
Date: 30 May 91 23:17:09 GMT
Distribution: usa
Organization: The Portal System (TM)
Lines: 12

Some of us at work were speculating on just how those new police speed
checking systems work - the ones that use lasers.  There was a segment
oon the local news about them (and typical of local news, it was generally
useless and non-revealing).

Anyone have any hard facts on how they work?  Best we came up with was a
IR near visible (say 900nm) wavelength, pulse modulated.  Still not sure how
well that would reflect off all cars.

Any ideas?

- CHRIS