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From: bobn@bmcg.UUCP (Bob Nebert)
Newsgroups: net.cycle
Subject: Re: Smart Traffic Lights?
Message-ID: <1764@bmcg.UUCP>
Date: Thu, 25-Jul-85 13:22:03 EDT
Article-I.D.: bmcg.1764
Posted: Thu Jul 25 13:22:03 1985
Date-Received: Wed, 31-Jul-85 02:08:33 EDT
References: <658@ihu1g.UUCP>
Distribution: net
Organization: Burroughs Corp. ASG, San Diego, CA.
Lines: 21

> Over the last several years here in the extreme western suburbs
> of Chicago, it has become quite common to install sensors in the
> road at traffic signals to help control the lights.  An example
> being that the left turn arrow does not come on if a car is not
> waiting in the left turn lane for several seconds before the
> light is due to change.  Notice that I said a "car"!  At least
> half of these sensors don't seem to be able to tell if a motorcycle
> is sitting right over it.  This was annoying when I had a relatively
> small XL350 but I figured a larger street bike would have enough
> mass to trigger any sensor.
> 
] Well the way it was explained to me is is that it is NOT the 
] mass or weight of the object but the height. The sensors put
] out a field so high ( look at my hands :-) about a foot. Cars
] trigger it but most bikes are to high to interfer (sp) with
] the signal.
]
]                           now your honor, this is the way it really was.....
]                           Bob Nebert
]                           sdcsvax!bmcg!bobn