Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mit-eddie!uw-beaver!tektronix!percival!bucket!loop!keithl
From: keithl@loop.UUCP (Keith Lofstrom)
Newsgroups: sci.electronics
Subject: Re: Car Detectors for Traffic Lights
Message-ID: <16@loop.UUCP>
Date: 4 Jun 89 22:49:40 GMT
References: <18811@cup.portal.com> <3185@kitty.uucp> <456@antares.uucp> <806@ivucsb.sba.ca.us> <2388@sigma.UUCP>
Reply-To: keithl@loop.UUCP (Keith Lofstrom)
Organization: Launch Loop, Portland, OR
Lines: 16

>}~for urban bicyclists; how do you get the left-turn light to change?

The sensors are usually inductive - I have had 90% success in laying my
bicycle down sideways so the center triangle is over the diamond shaped
loop in the street.  Some sensors aren't sensitive enough, though, and
it's hard to do with a loaded bike.

I can imagine a gadget that could spoof such a sensor, perhaps even from
a short distance - wouldn't it be nice to trip the sensor 10 seconds before
you get there?   Oh well, I'm usually riding the bike to GET AWAY from 
electronics!


-- 
Keith Lofstrom    keithl@loop    tektronix!tessi!qiclab!loop!keithl
Launch Loop, P.O. Box 1538, Portland, Oregon 97207   (503)-628-3645