Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!sun-barr!cs.utexas.edu!uunet!portal!cup.portal.com!Brad_Tiger_Houser
From: Brad_Tiger_Houser@cup.portal.com
Newsgroups: sci.electronics
Subject: Re: Car Detectors for Traffic Lights
Message-ID: <18969@cup.portal.com>
Date: 30 May 89 19:34:33 GMT
References: <18811@cup.portal.com> <3185@kitty.UUCP>
Distribution: usa
Organization: The Portal System (TM)
Lines: 15

While we are on the subject, in various Silicon Valley intersections there
are what appear to be Microwave antennas on the overhead signals.  A friend
told me they were for picking up transmissions from the public transit buses.
It looks like the bus has something that looks like a 4" outdoor speaker
on top.

Are the buses able to tell the street lights something like "Don't turn
red yet, I am coming through" or "Turn green in 30 seconds"?

If so, anyone out there know the secret to this?  Frequencies?  Codes?
(Legalities if caught using one?)

Brad Houser
Intel Corporation
Typical disclaimer deleted