From: Jim Thompson
Subject: Re: Smart traffic lights
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Date: Fri, 03 Jan 2003 15:40:09 GMT
NNTP-Posting-Date: Fri, 03 Jan 2003 10:40:09 EST
Organization: Cox Communications
On Fri, 3 Jan 2003 13:44:57 +0000,
John Woodgate ,
In Newsgroup: sci.electronics.design,
Entitled: "Re: Smart traffic lights",
Wrote the following:
|I read in sci.electronics.design that Robin
|wrote (in <email@example.com>) about 'Smart
|traffic lights', on Fri, 3 Jan 2003:
|>This may be a UK thing only but traffic lights here have the habit of
|>changing for no reason. Through-traffic will be moving along nicely
|>and then suddenly the lights will change. Everything stops. And waits.
|>Nothing happens on the green-light side, no traffic, nothing and then
|>equally as suddenly the lights change back.
|There is a sort of watch-dog timer that puts a set to green (and the
|intersecting one to red, of course), even if no vehicle has been
|detected. This used to allow for vehicles (bicycles) that were not heavy
|enough to work the pneumatic detector pads. Sometimes we had to stamp
|on the pad to get the lights to change.
|Now that the detectors are induction loops, it may be that some horse-
|drawn vehicles don't have enough metal in the right place to work them.
|Then there are wooden bicycles...
Yep, that's it. A certain percentage of the cycle is set up to
Here in Phoenix several towns are switching to video cameras, traffic
measurement by pattern recognition.
They also record traffic accidents. A recent victim of this
efficiency was a police officer in hot pursuit who ran a red light and
killed an innocent driver. He wasn't supposed to be in pursuit, lied
about it *and* his speed... now doing time in the slammer ;-)
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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